Paul received $1 from his father in the 1st week of school and $3 in the 2nd week. Each week, he receives $2 more than the week before.
- How much money did he received in the 13th week?
- In which week did he receive $17?
(a)
Amount that Paul received on 1st Week = $1
Amount that Paul received on 2nd Week = $12
Formula:
Amount received each week = 1 + (Week number - 1) x $2
Amount received on Week 13
= 1 + (13 - 1) x 2
= 1 + 12 x 2
= 1 + 24
= $25
(b)
Week number that Paul received $17
= [(17 - 1) ÷ 2] + 1
= (16 ÷ 2) + 1
= 8 + 1
= 9
Answer(s): (a) $25; (b) 9