PSLE Tammy has a number of pencils in three colours: brown, orange and red.
12 of the pencils are brown. The number of brown pencils is twice the number of orange pencils. What fraction of the pencils is red?
Brown |
Orange |
Red |
Total |
1x2 |
1x2 |
2x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
1 u |
4 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 red pencils
= 4 u - 2 u - 1 u
= 1 u
Fraction of the pencils that is red
=
14 Answer(s):
14