Rachel received $20 more pocket money than Gwen each month. Both of them spent $150 per month and saved the rest. After a few months, Rachel saved $1680 but Gwen only saved $1260.

1. What was Rachel's monthly pocket money?
2. Gwen wanted to save a total of $2100. How many more months did she need in order to save this amount?

(a)
Total amount that Rachel saved more than Gwen
= 1680 - 1260
= $420

Number of months taken for each of them to save their amounts
= 420 ÷ 20
= 21

Amount that Rachel saved each month
= 1680 ÷ 21
= $80

Rachel's monthly pocket money
= 80 + 150
= $230

(b)
Gwen's monthly pocket money
= 230 - 20
= $210

Amount that Gwen saved each month
= 210 - 150
= $60

Remaining amount that Gwen needed to save
= 2100 - 1260
= $840

Number of more months that Gwen needed to save the remaining $840
= 840 ÷ 60
= 14

Answer(s): (a) $230; (b) 14