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