George received $5 from his uncle in the 1st week of school and $7 in the 2nd week. Each week, he receives $2 more than the week before.
- How much money did he received in the 5th week?
- In which week did he receive $17?
(a)
Amount that George received on 1st Week = $5
Amount that George received on 2nd Week = $4
Formula:
Amount received each week = 5 + (Week number - 1) x $2
Amount received on Week 5
= 5 + (5 - 1) x 2
= 5 + 4 x 2
= 5 + 8
= $13
(b)
Week number that George received $17
= [(17 - 5) ÷ 2] + 1
= (12 ÷ 2) + 1
= 6 + 1
= 7
Answer(s): (a) $13; (b) 7