PSLE Jade has a number of pens in three colours: red, purple and yellow.
411 of the pens are red. The number of red pens is thrice the number of purple pens. What fraction of the pens is yellow?
Red |
Purple |
Yellow |
Total |
4x3 |
7x3 |
11x3 |
3x4 |
1x4 |
|
|
12 u |
4 u |
17 u |
33 u |
Number of red pens is the repeated identity.
Make the number of red pens the same.
LCM of 4 and 3 = 12
Number of yellow pens
= 33 u - 12 u - 4 u
= 17 u
Fraction of the pens that is yellow
=
1733 Answer(s):
1733