Question

If you have 100 apples in the fridge and samy take s3

Answer 1

100-3= 97-5=92-30= 62
62 apples left

Answer 2

You have 100
and samy takes 3
100-3
Mark takes 5
100-3-5
and Lizzy takes 30
100-3-5-30
Solve: 100-3-5-30
62
62 is your answer. 
You just basically subtract. :)