Eric received $4 from his uncle in the 1st week of school and $7 in the 2nd week. Each week, he receives $3 more than the week before.
- How much money did he received in the 8th week?
- In which week did he receive $19?
(a)
Amount that Eric received on 1st Week = $4
Amount that Eric received on 2nd Week = $7
Formula:
Amount received each week = 4 + (Week number - 1) x $3
Amount received on Week 8
= 4 + (8 - 1) x 3
= 4 + 7 x 3
= 4 + 21
= $25
(b)
Week number that Eric received $19
= [(19 - 4) ÷ 3] + 1
= (15 ÷ 3) + 1
= 5 + 1
= 6
Answer(s): (a) $25; (b) 6