Adam has some paint.
He uses
25 of it to paint 9 chairs and 7 desks.
The amount of paint needed to paint a desk is 3 times that of a chair.
- How many chairs can he paint using the remaining paint?
- How many desks can he paint using the remaining paint?
|
Chairs |
Desks |
Number |
9 |
7 |
Value |
1 u |
3 u |
Total value |
9 u |
21 u |
(a)
Paint needed for 1 chair = 1 u
Paint needed for 1 desk = 3 u
Paint needed for 9 chairs and 7 desks
= 9 x 1 u x 7 x 3 u
= 9 u + 21 u
= 30 u
25 of the paint = 30 u
15 of the paint = 30 u ÷ 2 = 15 u
Fraction of the remaining paint left
= 1 -
25=
35 35 of the paint = 3 x 15 u = 45 u
Remaining paint left = 45 u
Number of chairs that Adam can paint with the remaining paint
= 45 u ÷ 1 u
= 45
(b)
Number of desks that Adam can paint with the remaining paint
= 45 u ÷ 3 u
= 15
Answer(s): (a) 45; (b) 15