There were some yellow, white and pink notebooks in a box.
19 of the notebooks were white. The ratio of the number of yellow notebooks to the number of pink notebooks was 3 : 5. There were 324 fewer white notebooks than pink notebooks.
- Find the ratio of the number of yellow notebooks to the number of white notebooks to the number of pink notebooks in the box.
- How many pink notebooks were there?
White |
Yellow |
Pink |
Total |
1 |
8 |
9 |
|
3 |
5 |
|
1 u |
3 u |
5 u |
9 u |
(a)
Yellow : White : Pink
3 : 1 : 5
(b)
Number of fewer white notebooks than pink notebooks
= 5 u - 1 u
= 4 u
4 u = 324
1 u = 324 ÷ 4 = 81
Number of pink notebooks
= 5 u
= 5 x 81
= 405
Answer(s): (a) 3 : 1 : 5; (b) 405