The cost of a mattress is $12.

A pillow costs 75% less than a mattress.

Betty paid $462 for some pillows and mattresses.

60% of what she bought were mattresses.

(a) How many pillows did she buy?

(b) How much did Betty pay for the mattresses?

Notes to students:

1. If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12