Glen received $5 from his father in the 1st week of school and $8 in the 2nd week. Each week, he receives $3 more than the week before.
- How much money did he received in the 17th week?
- In which week did he receive $20?
(a)
Amount that Glen received on 1st Week = $5
Amount that Glen received on 2nd Week = $16
Formula:
Amount received each week = 5 + (Week number - 1) x $3
Amount received on Week 17
= 5 + (17 - 1) x 3
= 5 + 16 x 3
= 5 + 48
= $53
(b)
Week number that Glen received $20
= [(20 - 5) ÷ 3] + 1
= (15 ÷ 3) + 1
= 5 + 1
= 6
Answer(s): (a) $53; (b) 6