Joelle received $70 more pocket money than Irene each month. Both of them spent $180 per month and saved the rest. After a few months, Joelle saved $1620 but Irene only saved $1200.

1. What was Joelle's monthly pocket money?
2. Irene wanted to save a total of $2200. How many more months did she need in order to save this amount?

(a)
Total amount that Joelle saved more than Irene
= 1620 - 1200
= $420

Number of months taken for each of them to save their amounts
= 420 ÷ 70
= 6

Amount that Joelle saved each month
= 1620 ÷ 6
= $270

Joelle's monthly pocket money
= 270 + 180
= $450

(b)
Irene's monthly pocket money
= 450 - 70
= $380

Amount that Irene saved each month
= 380 - 180
= $200

Remaining amount that Irene needed to save
= 2200 - 1200
= $1000

Number of more months that Irene needed to save the remaining $1000
= 1000 ÷ 200
= 5

Answer(s): (a) $450; (b) 5