Valen received $4 from his aunt in the 1st week of school and $7 in the 2nd week. Each week, he receives $3 more than the week before.
- How much money did he received in the 19th week?
- In which week did he receive $25?
(a)
Amount that Valen received on 1st Week = $4
Amount that Valen received on 2nd Week = $18
Formula:
Amount received each week = 4 + (Week number - 1) x $3
Amount received on Week 19
= 4 + (19 - 1) x 3
= 4 + 18 x 3
= 4 + 54
= $58
(b)
Week number that Valen received $25
= [(25 - 4) ÷ 3] + 1
= (21 ÷ 3) + 1
= 7 + 1
= 8
Answer(s): (a) $58; (b) 8