PSLE Shiyun has a number of pencils in three colours: brown, red and orange.
15 of the pencils are brown. The number of brown pencils is twice the number of red pencils. What fraction of the pencils is orange?
Brown |
Red |
Orange |
Total |
1x2 |
4x2 |
5x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
7 u |
10 u |
Number of brown pencils is the repeated identity.
Make the number of brown pencils the same.
LCM of 1 and 2 = 2
Number of orange pencils
= 10 u - 2 u - 1 u
= 7 u
Fraction of the pencils that is orange
=
710 Answer(s):
710