PSLE Jean has a number of pencils in three colours: brown, green and orange.
57 of the pencils are brown. The number of brown pencils is four times the number of green pencils. What fraction of the pencils is orange?
Brown |
Green |
Orange |
Total |
5x4 |
2x4 |
7x4 |
4x5 |
1x5 |
|
|
20 u |
5 u |
3 u |
28 u |
Number of brown pencils is the repeated identity.
Make the number of brown pencils the same.
LCM of 5 and 4 = 20
Number of orange pencils
= 28 u - 20 u - 5 u
= 3 u
Fraction of the pencils that is orange
=
328 Answer(s):
328