PSLE Risa has a number of pencils in three colours: purple, red and brown.
38 of the pencils are purple. The number of purple pencils is twice the number of red pencils. What fraction of the pencils is brown?
Purple |
Red |
Brown |
Total |
3x2 |
5x2 |
8x2 |
2x3 |
1x3 |
|
|
6 u |
3 u |
7 u |
16 u |
Number of purple pencils is the repeated identity.
Make the number of purple pencils the same.
LCM of 3 and 2 = 6
Number of brown pencils
= 16 u - 6 u - 3 u
= 7 u
Fraction of the pencils that is brown
=
716 Answer(s):
716