Ryan received $5 from his mother in the 1st week of school and $11 in the 2nd week. Each week, he receives $6 more than the week before.
- How much money did he received in the 20th week?
- In which week did he receive $29?
(a)
Amount that Ryan received on 1st Week = $5
Amount that Ryan received on 2nd Week = $19
Formula:
Amount received each week = 5 + (Week number - 1) x $6
Amount received on Week 20
= 5 + (20 - 1) x 6
= 5 + 19 x 6
= 5 + 114
= $119
(b)
Week number that Ryan received $29
= [(29 - 5) ÷ 6] + 1
= (24 ÷ 6) + 1
= 4 + 1
= 5
Answer(s): (a) $119; (b) 5