Reggie received $5 from his aunt 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 11th week?
- In which week did he receive $20?
(a)
Amount that Reggie received on 1st Week = $5
Amount that Reggie received on 2nd Week = $10
Formula:
Amount received each week = 5 + (Week number - 1) x $3
Amount received on Week 11
= 5 + (11 - 1) x 3
= 5 + 10 x 3
= 5 + 30
= $35
(b)
Week number that Reggie received $20
= [(20 - 5) ÷ 3] + 1
= (15 ÷ 3) + 1
= 5 + 1
= 6
Answer(s): (a) $35; (b) 6