Tim received $3 from his uncle in the 1st week of school and $7 in the 2nd week. Each week, he receives $4 more than the week before.
- How much money did he received in the 7th week?
- In which week did he receive $23?
(a)
Amount that Tim received on 1st Week = $3
Amount that Tim received on 2nd Week = $6
Formula:
Amount received each week = 3 + (Week number - 1) x $4
Amount received on Week 7
= 3 + (7 - 1) x 4
= 3 + 6 x 4
= 3 + 24
= $27
(b)
Week number that Tim received $23
= [(23 - 3) ÷ 4] + 1
= (20 ÷ 4) + 1
= 5 + 1
= 6
Answer(s): (a) $27; (b) 6