Adam has stickers in 4 colours.
38 of the stickers are yellow.
The rest of the stickers are blue, green and red in the ratio of 1 : 2 : 4.
If there are 20 more green stickers than blue stickers,
how many yellow stickers are there?
Yellow |
Blue |
Green |
Red |
3 x 7 |
5 x 7 |
|
1 x 5 |
2 x 5 |
4 x 5 |
21 u |
5 u |
10 u |
20 u |
The number of yellow, blue and green stickers is the combined repeated identity.
Make the number of yellow, blue and green stickers the same using the LCM of 5 and 7.
LCM of 5 and 7 = 35
Number of more green stickers than blue stickers
= 10 u - 5 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of yellow stickers
= 21 u
= 21 x 4
= 84
Answer(s): 84