Question

Steven has $10. Each week he earns $2.

Show how much money he will have at the end of 10 weeks.
How many weeks will it take until he has $25?

Answer 1

$30 at the end of 10 weeks

7.5 weeks, or 8 (rounded)

Explanation:

10*2=20

10+20=30

10+2x=25

2x=25-10

2x=15

x=7.5

7.5 weeks, or 8 (rounded)

Answer 2

(a) 2*10 = 20

10+20=30

(b) ceil((25-10)/2) = 8