Peter received $5 from his mother in the 1st week of school and $11 in the 2nd week. Each week, he receives $6 more than the week before.
- How much money did he received in the 11th week?
- In which week did he receive $17?
(a)
Amount that Peter received on 1st Week = $5
Amount that Peter received on 2nd Week = $10
Formula:
Amount received each week = 5 + (Week number - 1) x $6
Amount received on Week 11
= 5 + (11 - 1) x 6
= 5 + 10 x 6
= 5 + 60
= $65
(b)
Week number that Peter received $17
= [(17 - 5) ÷ 6] + 1
= (12 ÷ 6) + 1
= 2 + 1
= 3
Answer(s): (a) $65; (b) 3