Gwen received $20 more pocket money than Risa each month. Both of them spent $190 per month and saved the rest. After a few months, Gwen saved $1760 but Risa only saved $1320.

1. What was Gwen's monthly pocket money?
2. Risa wanted to save a total of $2220. How many more months did she need in order to save this amount?

(a)
Total amount that Gwen saved more than Risa
= 1760 - 1320
= $440

Number of months taken for each of them to save their amounts
= 440 ÷ 20
= 22

Amount that Gwen saved each month
= 1760 ÷ 22
= $80

Gwen's monthly pocket money
= 80 + 190
= $270

(b)
Risa's monthly pocket money
= 270 - 20
= $250

Amount that Risa saved each month
= 250 - 190
= $60

Remaining amount that Risa needed to save
= 2220 - 1320
= $900

Number of more months that Risa needed to save the remaining $900
= 900 ÷ 60
= 15

Answer(s): (a) $270; (b) 15