diff --git a/queries.md b/queries.md
index c1ab2c4..b3e5f1c 100644
--- a/queries.md
+++ b/queries.md
@@ -1,78 +1,88 @@
-![Root logo](https://imgur.com/Hq8xgzy.png)
-# Answers
-
-### 1. All the companies whose name match 'Babelgum'. Retrieve only their `name` field.
-
-<!-- Your Code Goes Here -->
-
-### 2. All the companies that have more than 5000 employees. Limit the search to 20 companies and sort them by **number of employees**.
-
-<!-- Your Code Goes Here -->
-
-### 3. All the companies founded between 2000 and 2005, both years included. Retrieve only the `name` and `founded_year` fields.
-
-<!-- Your Code Goes Here -->
-
-### 4. All the companies that had a Valuation Amount of more than 100.000.000 and have been founded before 2010. Retrieve only the `name` and `ipo` fields.
-
-<!-- Your Code Goes Here -->
-
-### 5. All the companies that have less than 1000 employees and have been founded before 2005. Order them by the number of employees and limit the search to 10 companies.
-
-<!-- Your Code Goes Here -->
-
-### 6. All the companies that don't include the `partners` field.
-
-<!-- Your Code Goes Here -->
-
-### 7. All the companies that have a null type of value on the `category_code` field.
-
-<!-- Your Code Goes Here -->
-
-### 8. All the companies that have at least 100 employees but less than 1000. Retrieve only the `name` and `number of employees` fields.
-
-<!-- Your Code Goes Here -->
-
-### 9. Order all the companies by their IPO price in a descending order.
-
-<!-- Your Code Goes Here -->
-
-### 10. Retrieve the 10 companies with most employees, order by the `number of employees`
-
-<!-- Your Code Goes Here -->
-
-### 11. All the companies founded on the second semester of the year. Limit your search to 1000 companies.
-
-<!-- Your Code Goes Here -->
-
-### 12. All the companies founded before 2000 that have an acquisition amount of more than 10.000.000
-
-<!-- Your Code Goes Here -->
-
-### 13. All the companies that have been acquired after 2010, order by the acquisition amount, and retrieve only their `name` and `acquisition` field.
-
-<!-- Your Code Goes Here -->
-
-### 14. Order the companies by their `founded year`, retrieving only their `name` and `founded year`.
-
-<!-- Your Code Goes Here -->
-
-### 15. All the companies that have been founded on the first seven days of the month, including the seventh. Sort them by their `acquisition price` in a descending order. Limit the search to 10 documents.
-
-<!-- Your Code Goes Here -->
-
-### 16. All the companies on the 'web' `category` that have more than 4000 employees. Sort them by the amount of employees in ascending order.
-
-<!-- Your Code Goes Here -->
-
-### 17. All the companies whose acquisition amount is more than 10.000.000, and currency is 'EUR'.
-
-<!-- Your Code Goes Here -->
-
-### 18. All the companies that have been acquired on the first trimester of the year. Limit the search to 10 companies, and retrieve only their `name` and `acquisition` fields.
-
-<!-- Your Code Goes Here -->
-
-### 19. All the companies that have been founded between 2000 and 2010, but have not been acquired before 2011.
-
-<!-- Your Code Goes Here -->
+![Root logo](https://imgur.com/Hq8xgzy.png)
+# Answers
+
+### 1. All the companies whose name match 'Babelgum'. Retrieve only their `name` field.
+
+db.companies.find({ name: 'Babelgum' }, { name: 1, _id: 0 });
+
+### 2. All the companies that have more than 5000 employees. Limit the search to 20 companies and sort them by **number of employees**.
+
+db.companies.find({ number_of_employees: { $gt: 5000 } })
+           .sort({ number_of_employees: 1 })
+           .limit(20);
+
+### 3. All the companies founded between 2000 and 2005, both years included. Retrieve only the `name` and `founded_year` fields.
+
+db.companies.find({ founded_year: { $gte: 2000, $lte: 2005 } }, { name: 1, founded_year: 1, _id: 0 });
+
+### 4. All the companies that had a Valuation Amount of more than 100.000.000 and have been founded before 2010. Retrieve only the `name` and `ipo` fields.
+
+db.companies.find({ "ipo.valuation_amount": { $gt: 100000000 }, founded_year: { $lt: 2010 } }, { name: 1, ipo: 1, _id: 0 });
+
+### 5. All the companies that have less than 1000 employees and have been founded before 2005. Order them by the number of employees and limit the search to 10 companies.
+
+db.companies.find({ number_of_employees: { $lt: 1000 }, founded_year: { $lt: 2005 } })
+           .sort({ number_of_employees: 1 })
+           .limit(10);
+
+### 6. All the companies that don't include the `partners` field.
+
+db.companies.find({ partners: { $exists: false } });
+
+### 7. All the companies that have a null type of value on the `category_code` field.
+
+db.companies.find({ category_code: null });
+
+### 8. All the companies that have at least 100 employees but less than 1000. Retrieve only the `name` and `number of employees` fields.
+
+db.companies.find({ number_of_employees: { $gte: 100, $lt: 1000 } }, { name: 1, number_of_employees: 1, _id: 0 });
+
+### 9. Order all the companies by their IPO price in a descending order.
+
+db.companies.find().sort({ "ipo.valuation_amount": -1 });
+
+### 10. Retrieve the 10 companies with most employees, order by the `number of employees`
+
+db.companies.find().sort({ number_of_employees: -1 }).limit(10);
+
+### 11. All the companies founded on the second semester of the year. Limit your search to 1000 companies.
+
+db.companies.find({ founded_month: { $gte: 7, $lte: 12 } }).limit(1000);
+
+### 12. All the companies founded before 2000 that have an acquisition amount of more than 10.000.000
+
+db.companies.find({ founded_year: { $lt: 2000 }, "acquisition.price_amount": { $gt: 10000000 } });
+
+### 13. All the companies that have been acquired after 2010, order by the acquisition amount, and retrieve only their `name` and `acquisition` field.
+
+db.companies.find({ "acquisition.acquired_year": { $gt: 2010 } }, { name: 1, acquisition: 1, _id: 0 })
+           .sort({ "acquisition.price_amount": -1 });
+
+### 14. Order the companies by their `founded year`, retrieving only their `name` and `founded year`.
+
+db.companies.find({}, { name: 1, founded_year: 1, _id: 0 }).sort({ founded_year: 1 });
+
+### 15. All the companies that have been founded on the first seven days of the month, including the seventh. Sort them by their `acquisition price` in a descending order. Limit the search to 10 documents.
+
+db.companies.find({ founded_day: { $gte: 1, $lte: 7 } })
+           .sort({ "acquisition.price_amount": -1 })
+           .limit(10);
+
+### 16. All the companies on the 'web' `category` that have more than 4000 employees. Sort them by the amount of employees in ascending order.
+
+db.companies.find({ category_code: 'web', number_of_employees: { $gt: 4000 } })
+           .sort({ number_of_employees: 1 });
+
+### 17. All the companies whose acquisition amount is more than 10.000.000, and currency is 'EUR'.
+
+db.companies.find({ "acquisition.price_amount": { $gt: 10000000 }, "acquisition.price_currency_code": 'EUR' });
+
+
+### 18. All the companies that have been acquired on the first trimester of the year. Limit the search to 10 companies, and retrieve only their `name` and `acquisition` fields.
+
+db.companies.find({ "acquisition.acquired_month": { $gte: 1, $lte: 3 } }, { name: 1, acquisition: 1, _id: 0 })
+           .limit(10);
+
+### 19. All the companies that have been founded between 2000 and 2010, but have not been acquired before 2011.
+
+db.companies.find({ founded_year: { $gte: 2000, $lte: 2010 }, "acquisition.acquired_year": { $gte: 2011 } });