PSLE Linda has a number of pencils in three colours: red, blue and brown.
23 of the pencils are red. The number of red pencils is thrice the number of blue pencils. What fraction of the pencils is brown?
Red |
Blue |
Brown |
Total |
2x3 |
1x3 |
3x3 |
3x2 |
1x2 |
|
|
6 u |
2 u |
1 u |
9 u |
Number of red pencils is the repeated identity.
Make the number of red pencils the same.
LCM of 2 and 3 = 6
Number of brown pencils
= 9 u - 6 u - 2 u
= 1 u
Fraction of the pencils that is brown
=
19 Answer(s):
19