Albert received $3 from his mother 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 10th week?
- In which week did he receive $27?
(a)
Amount that Albert received on 1st Week = $3
Amount that Albert received on 2nd Week = $9
Formula:
Amount received each week = 3 + (Week number - 1) x $4
Amount received on Week 10
= 3 + (10 - 1) x 4
= 3 + 9 x 4
= 3 + 36
= $39
(b)
Week number that Albert received $27
= [(27 - 3) ÷ 4] + 1
= (24 ÷ 4) + 1
= 6 + 1
= 7
Answer(s): (a) $39; (b) 7