Discover the answers you need at Westonci.ca, where experts provide clear and concise information on various topics. Join our platform to connect with experts ready to provide precise answers to your questions in various areas. Explore comprehensive solutions to your questions from knowledgeable professionals across various fields on our platform.

In a certain class, 22 pupils take one or more of chemistry, economics and government. 12 take economics, 8 take government and 7 take chemistry. Nobody takes economics and chemistry, and 4 pupils take economics and government. How many pupils took both chemistry and government. ​