Adam has some paint.
He uses
712 of it to paint 3 doors and 5 desks.
The amount of paint needed to paint a desk is 5 times that of a door.
- How many doors can he paint using the remaining paint?
- How many desks can he paint using the remaining paint?
|
Doors |
Desks |
Number |
3 |
5 |
Value |
1 u |
5 u |
Total value |
3 u |
25 u |
(a)
Paint needed for 1 door = 1 u
Paint needed for 1 desk = 5 u
Paint needed for 3 doors and 5 desks
= 3 x 1 u x 5 x 5 u
= 3 u + 25 u
= 28 u
712 of the paint = 28 u
112 of the paint = 28 u ÷ 7 = 4 u
Fraction of the remaining paint left
= 1 -
712=
512 512 of the paint = 5 x 4 u = 20 u
Remaining paint left = 20 u
Number of doors that Adam can paint with the remaining paint
= 20 u ÷ 1 u
= 20
(b)
Number of desks that Adam can paint with the remaining paint
= 20 u ÷ 5 u
= 4
Answer(s): (a) 20; (b) 4