In primary school there shall be 3 teachers to 60 students. If there are 400 students enrolled in the school, how many teachers should be there in the school in the same ratio?

In a primary school there shall be 2 teachers to 40 students. If there are 200 students enrolled in the school, how many teachers should be there in the school in the same ratio?

In a primary school there shall be 4 teachers to 80 students. If there are 600 students enrolled in the school, how many teachers should be there in the school in the same ratio?

Aschool collected 2601 as fees from its students. If fee paid by each student and number of students in the school were equal, how many students were there in the school?.

In a school survey it was found that for every 4 girls there are 5 boys.If there are 54 children in a class. How many are boys.

In a class of 45 students 3/5 of the total number of students are girls how many students of the class are boys?

Which of the following are sets? The collection of teachers in a school .

The mean ago of 25 teachers in a schools is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place . If now the mean age of the teachers in this schools is 39 years, then the age (in years) of the newly appointed teacher is

In a school there are 20 teachers who teach mathematics or physics. Of these, 12 teach mathematics and 4 teach both physics and mathematics. How many teach physics ?

A student observed in his school garden that leaves of some plants are folding at the evening when he is going to home and unfolded and expanded when he is coming to the school in the morning. Which part of the leaf is responsible for these changes

40 benches are required to seat 160 students. How many benches will be required to seat 240 students at the same rate ?