Tim received $5 from his father in the 1st week of school and $10 in the 2nd week. Each week, he receives $5 more than the week before.
- How much money did he received in the 6th week?
- In which week did he receive $15?
(a)
Amount that Tim received on 1st Week = $5
Amount that Tim received on 2nd Week = $5
Formula:
Amount received each week = 5 + (Week number - 1) x $5
Amount received on Week 6
= 5 + (6 - 1) x 5
= 5 + 5 x 5
= 5 + 25
= $30
(b)
Week number that Tim received $15
= [(15 - 5) ÷ 5] + 1
= (10 ÷ 5) + 1
= 2 + 1
= 3
Answer(s): (a) $30; (b) 3