Min received $50 more pocket money than Xuan each month. Both of them spent $100 per month and saved the rest. After a few months, Min saved $1700 but Xuan only saved $1200.

1. What was Min's monthly pocket money?
2. Xuan wanted to save a total of $2400. How many more months did she need in order to save this amount?

(a)
Total amount that Min saved more than Xuan
= 1700 - 1200
= $500

Number of months taken for each of them to save their amounts
= 500 ÷ 50
= 10

Amount that Min saved each month
= 1700 ÷ 10
= $170

Min's monthly pocket money
= 170 + 100
= $270

(b)
Xuan's monthly pocket money
= 270 - 50
= $220

Amount that Xuan saved each month
= 220 - 100
= $120

Remaining amount that Xuan needed to save
= 2400 - 1200
= $1200

Number of more months that Xuan needed to save the remaining $1200
= 1200 ÷ 120
= 10

Answer(s): (a) $270; (b) 10