PSLE Sabrina has a number of pens in three colours: red, blue and purple.
27 of the pens are red. The number of red pens is thrice the number of blue pens. What fraction of the pens is purple?
Red |
Blue |
Purple |
Total |
2x3 |
5x3 |
7x3 |
3x2 |
1x2 |
|
|
6 u |
2 u |
13 u |
21 u |
Number of red pens is the repeated identity.
Make the number of red pens the same.
LCM of 2 and 3 = 6
Number of purple pens
= 21 u - 6 u - 2 u
= 13 u
Fraction of the pens that is purple
=
1321 Answer(s):
1321