Cody received $5 from his father in the 1st week of school and $10 in the 2nd week. Each week, he receives $5 more than the week before.
- How much money did he received in the 12th week?
- In which week did he receive $20?
(a)
Amount that Cody received on 1st Week = $5
Amount that Cody received on 2nd Week = $11
Formula:
Amount received each week = 5 + (Week number - 1) x $5
Amount received on Week 12
= 5 + (12 - 1) x 5
= 5 + 11 x 5
= 5 + 55
= $60
(b)
Week number that Cody received $20
= [(20 - 5) ÷ 5] + 1
= (15 ÷ 5) + 1
= 3 + 1
= 4
Answer(s): (a) $60; (b) 4