There are four times as many black coats as grey coats in a sale. If there are 100 black and grey coats altogether,
- how many black coats are there?
- how many more black coats than grey coats?
(a)
Number of grey coats = 1 u
Number of black coats
= 4 x 1 u
= 4 u
Total number of coats
= 4 u + 1 u
= 5 u
5 u = 100
1 u = 100 ÷ 5 = 20
Number of black coats
= 4 u
= 4 x 20
= 80
(b)
Number of more black coats than grey coats
= 4 u - 1 u
= 3 u
= 3 x 20
= 60
Answer(s): (a) 80; (b) 60