Erika received $70 more pocket money than Gillian each month. Both of them spent $150 per month and saved the rest. After a few months, Erika saved $1520 but Gillian only saved $1240.

1. What was Erika's monthly pocket money?
2. Gillian wanted to save a total of $2480. How many more months did she need in order to save this amount?

(a)
Total amount that Erika saved more than Gillian
= 1520 - 1240
= $280

Number of months taken for each of them to save their amounts
= 280 ÷ 70
= 4

Amount that Erika saved each month
= 1520 ÷ 4
= $380

Erika's monthly pocket money
= 380 + 150
= $530

(b)
Gillian's monthly pocket money
= 530 - 70
= $460

Amount that Gillian saved each month
= 460 - 150
= $310

Remaining amount that Gillian needed to save
= 2480 - 1240
= $1240

Number of more months that Gillian needed to save the remaining $1240
= 1240 ÷ 310
= 4

Answer(s): (a) $530; (b) 4