Emily received $20 more pocket money than Tiffany each month. Both of them spent $170 per month and saved the rest. After a few months, Emily saved $1680 but Tiffany only saved $1360.

1. What was Emily's monthly pocket money?
2. Tiffany wanted to save a total of $2380. How many more months did she need in order to save this amount?

(a)
Total amount that Emily saved more than Tiffany
= 1680 - 1360
= $320

Number of months taken for each of them to save their amounts
= 320 ÷ 20
= 16

Amount that Emily saved each month
= 1680 ÷ 16
= $105

Emily's monthly pocket money
= 105 + 170
= $275

(b)
Tiffany's monthly pocket money
= 275 - 20
= $255

Amount that Tiffany saved each month
= 255 - 170
= $85

Remaining amount that Tiffany needed to save
= 2380 - 1360
= $1020

Number of more months that Tiffany needed to save the remaining $1020
= 1020 ÷ 85
= 12

Answer(s): (a) $275; (b) 12