Уравнение:150 X y +400=4900:7 помогите пожалуйста решить​

пожалуйства вставьте слова в предложения:(

1. Most children attend _____ where education is free. 
2. Some children attend either ____ or ____ where parents pay for their children's education. 
3. Schools where children not only studu but live are called _____ 
4. Education is compulsory between the ages _____ 
5. At the age of 5 most children start _____ 
6 Comprehensive schools provide ______ 
7. At the and of each stage pupils take ______ 
8. Children can get higher education at _____ 
9. To enter a university you have to take ____