Adam has stickers in 4 colours.
25 of the stickers are blue.
The rest of the stickers are red, yellow and green in the ratio of 2 : 4 : 7.
If there are 30 more yellow stickers than red stickers,
how many blue stickers are there?
Blue |
Red |
Yellow |
Green |
2 x 13 |
3 x 13 |
|
2 x 3 |
4 x 3 |
7 x 3 |
26 u |
6 u |
12 u |
21 u |
The number of blue, red and yellow stickers is the combined repeated identity.
Make the number of blue, red and yellow stickers the same using the LCM of 3 and 13.
LCM of 3 and 13 = 39
Number of more yellow stickers than red stickers
= 12 u - 6 u
= 6 u
6 u = 30
1 u = 30 ÷ 6 = 5
Number of blue stickers
= 26 u
= 26 x 5
= 130
Answer(s): 130