Bryan received $2 from his mother in the 1st week of school and $4 in the 2nd week. Each week, he receives $2 more than the week before.
- How much money did he received in the 18th week?
- In which week did he receive $24?
(a)
Amount that Bryan received on 1st Week = $2
Amount that Bryan received on 2nd Week = $17
Formula:
Amount received each week = 2 + (Week number - 1) x $2
Amount received on Week 18
= 2 + (18 - 1) x 2
= 2 + 17 x 2
= 2 + 34
= $36
(b)
Week number that Bryan received $24
= [(24 - 2) ÷ 2] + 1
= (22 ÷ 2) + 1
= 11 + 1
= 12
Answer(s): (a) $36; (b) 12