Question

Mr david gave some cookies to his pupils if he gives each pupil 7 cookies he would have 10 cookies left if he gave each of his pupils 9 cookies he would be short of 4 cookies how much pupils does he have

Answer 1

3 pupils

Explanation:

7p + 10 = T

9p = T - 4

and then solve by substitution

9p = 7p + 10 - 4

9p -7p = 10 - 4

2p = 6

p = 3