Mark spent
25 of his salary on a mini-helicopter. He spent
12 of the remaining salary on a mini plane.
- What fraction of his salary was left?
- If he had left $21, how much salary did Mark have at first?
(a)
Fraction of salary left after spending on a mini-helicopter
= 1 -
25=
35Fraction of remaining salary left
= 1 -
12=
12Fraction of his salary left
=
35 x
12=
310(b)
Amount that Mark had at first = 10 u
Amount that Mark had left = 3 u
3 u = 21
1 u = 21 ÷ 3 = 7
Total amount that Mark had at first
= 10 u
= 10 x 7
= $70
Answer(s): (a)
310; (b) $70