Question

Tracy has 35 students in her class. 3/7 of them are ten years old and the remainder is nine years old. How many students are nine years old?

Answer 1

20 students are 9 yr olds

Explanation:

To calculate how many 10 yr olds do this ...

3/7 x 35 which equals 15

15 students are 10 yr olds

to find how many 9 yr olds then subtract 15 from 35

which equals 20

There's your answer.

I hope it's helpful! :)