Xavier 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 7th week?
- In which week did he receive $16?
(a)
Amount that Xavier received on 1st Week = $4
Amount that Xavier received on 2nd Week = $6
Formula:
Amount received each week = 4 + (Week number - 1) x $3
Amount received on Week 7
= 4 + (7 - 1) x 3
= 4 + 6 x 3
= 4 + 18
= $22
(b)
Week number that Xavier received $16
= [(16 - 4) ÷ 3] + 1
= (12 ÷ 3) + 1
= 4 + 1
= 5
Answer(s): (a) $22; (b) 5