Adam has some paint.
He uses
25 of it to paint 6 desks and 3 doors.
The amount of paint needed to paint a door is 2 times that of a desk.
- How many desks can he paint using the remaining paint?
- How many doors can he paint using the remaining paint?
|
Desks |
Doors |
Number |
6 |
3 |
Value |
1 u |
2 u |
Total value |
6 u |
6 u |
(a)
Paint needed for 1 desk = 1 u
Paint needed for 1 door = 2 u
Paint needed for 6 desks and 3 doors
= 6 x 1 u x 3 x 2 u
= 6 u + 6 u
= 12 u
25 of the paint = 12 u
15 of the paint = 12 u ÷ 2 = 6 u
Fraction of the remaining paint left
= 1 -
25=
35 35 of the paint = 3 x 6 u = 18 u
Remaining paint left = 18 u
Number of desks that Adam can paint with the remaining paint
= 18 u ÷ 1 u
= 18
(b)
Number of doors that Adam can paint with the remaining paint
= 18 u ÷ 2 u
= 9
Answer(s): (a) 18; (b) 9