PSLE Roshel has a number of pens in three colours: yellow, purple and blue.
47 of the pens are yellow. The number of yellow pens is thrice the number of purple pens. What fraction of the pens is blue?
Yellow |
Purple |
Blue |
Total |
4x3 |
3x3 |
7x3 |
3x4 |
1x4 |
|
|
12 u |
4 u |
5 u |
21 u |
Number of yellow pens is the repeated identity.
Make the number of yellow pens the same.
LCM of 4 and 3 = 12
Number of blue pens
= 21 u - 12 u - 4 u
= 5 u
Fraction of the pens that is blue
=
521 Answer(s):
521