A bakery sold 222 mocha cupcakes in a day, which was 74% of the total number of cupcakes sold that day. How many total cupcakes did the bakery sell that day?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?