Vincent received $2 from his mother in the 1st week of school and $7 in the 2nd week. Each week, he receives $5 more than the week before.
- How much money did he received in the 9th week?
- In which week did he receive $22?
(a)
Amount that Vincent received on 1st Week = $2
Amount that Vincent received on 2nd Week = $8
Formula:
Amount received each week = 2 + (Week number - 1) x $5
Amount received on Week 9
= 2 + (9 - 1) x 5
= 2 + 8 x 5
= 2 + 40
= $42
(b)
Week number that Vincent received $22
= [(22 - 2) ÷ 5] + 1
= (20 ÷ 5) + 1
= 4 + 1
= 5
Answer(s): (a) $42; (b) 5