Daniel 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 14th week?
- In which week did he receive $15?
(a)
Amount that Daniel received on 1st Week = $3
Amount that Daniel received on 2nd Week = $13
Formula:
Amount received each week = 3 + (Week number - 1) x $4
Amount received on Week 14
= 3 + (14 - 1) x 4
= 3 + 13 x 4
= 3 + 52
= $55
(b)
Week number that Daniel received $15
= [(15 - 3) ÷ 4] + 1
= (12 ÷ 4) + 1
= 3 + 1
= 4
Answer(s): (a) $55; (b) 4