Julian received $5 from his father 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 8th week?
- In which week did he receive $15?
(a)
Amount that Julian received on 1st Week = $5
Amount that Julian received on 2nd Week = $7
Formula:
Amount received each week = 5 + (Week number - 1) x $2
Amount received on Week 8
= 5 + (8 - 1) x 2
= 5 + 7 x 2
= 5 + 14
= $19
(b)
Week number that Julian received $15
= [(15 - 5) ÷ 2] + 1
= (10 ÷ 2) + 1
= 5 + 1
= 6
Answer(s): (a) $19; (b) 6