Since 3 teachers are needed for 70 children and there are 14700 children, multiply 14700 by 3. The answer (44100) can then be divided by 70 which will get you 630. They have 612 teachers so subtract 612 from 630. The difference is 18 so they need 18 teachers.
Citations are imperative to every type of essay, however they are most important to an informative one in order to convey strongest senses of ethos (reliability).
