Eric received $4 from his mother in the 1st week of school and $9 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 $29?
(a)
Amount that Eric received on 1st Week = $4
Amount that Eric received on 2nd Week = $11
Formula:
Amount received each week = 4 + (Week number - 1) x $5
Amount received on Week 12
= 4 + (12 - 1) x 5
= 4 + 11 x 5
= 4 + 55
= $59
(b)
Week number that Eric received $29
= [(29 - 4) ÷ 5] + 1
= (25 ÷ 5) + 1
= 5 + 1
= 6
Answer(s): (a) $59; (b) 6