Gwen received $20 more pocket money than Yoko each month. Both of them spent $120 per month and saved the rest. After a few months, Gwen saved $1710 but Yoko only saved $1330.

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

(a)
Total amount that Gwen saved more than Yoko
= 1710 - 1330
= $380

Number of months taken for each of them to save their amounts
= 380 ÷ 20
= 19

Amount that Gwen saved each month
= 1710 ÷ 19
= $90

Gwen's monthly pocket money
= 90 + 120
= $210

(b)
Yoko's monthly pocket money
= 210 - 20
= $190

Amount that Yoko saved each month
= 190 - 120
= $70

Remaining amount that Yoko needed to save
= 2100 - 1330
= $770

Number of more months that Yoko needed to save the remaining $770
= 770 ÷ 70
= 11

Answer(s): (a) $210; (b) 11