There were some yellow, white and pink pencils in a box.
213 of the pencils were white. The ratio of the number of yellow pencils to the number of pink pencils was 4 : 7. There were 325 fewer white pencils than pink pencils.
- Find the ratio of the number of yellow pencils to the number of white pencils to the number of pink pencils in the box.
- How many pink pencils were there?
White |
Yellow |
Pink |
Total |
2 |
11 |
13 |
|
4 |
7 |
|
2 u |
4 u |
7 u |
13 u |
(a)
Yellow : White : Pink
4 : 2 : 7
(b)
Number of fewer white pencils than pink pencils
= 7 u - 2 u
= 5 u
5 u = 325
1 u = 325 ÷ 5 = 65
Number of pink pencils
= 7 u
= 7 x 65
= 455
Answer(s): (a) 4 : 2 : 7; (b) 455