Flynn received $5 from his father in the 1st week of school and $9 in the 2nd week. Each week, he receives $4 more than the week before.
- How much money did he received in the 18th week?
- In which week did he receive $29?
(a)
Amount that Flynn received on 1st Week = $5
Amount that Flynn received on 2nd Week = $17
Formula:
Amount received each week = 5 + (Week number - 1) x $4
Amount received on Week 18
= 5 + (18 - 1) x 4
= 5 + 17 x 4
= 5 + 68
= $73
(b)
Week number that Flynn received $29
= [(29 - 5) ÷ 4] + 1
= (24 ÷ 4) + 1
= 6 + 1
= 7
Answer(s): (a) $73; (b) 7