PSLE Yen has a number of pens in three colours: purple, red and orange.
25 of the pens are purple. The number of purple pens is thrice the number of red pens. What fraction of the pens is orange?
Purple |
Red |
Orange |
Total |
2x3 |
3x3 |
5x3 |
3x2 |
1x2 |
|
|
6 u |
2 u |
7 u |
15 u |
Number of purple pens is the repeated identity.
Make the number of purple pens the same.
LCM of 2 and 3 = 6
Number of orange pens
= 15 u - 6 u - 2 u
= 7 u
Fraction of the pens that is orange
=
715 Answer(s):
715