Xavier received $5 from his father in the 1st week of school and $12 in the 2nd week. Each week, he receives $7 more than the week before.
- How much money did he received in the 9th week?
- In which week did he receive $26?
(a)
Amount that Xavier received on 1st Week = $5
Amount that Xavier received on 2nd Week = $8
Formula:
Amount received each week = 5 + (Week number - 1) x $7
Amount received on Week 9
= 5 + (9 - 1) x 7
= 5 + 8 x 7
= 5 + 56
= $61
(b)
Week number that Xavier received $26
= [(26 - 5) ÷ 7] + 1
= (21 ÷ 7) + 1
= 3 + 1
= 4
Answer(s): (a) $61; (b) 4