PSLE Zoe has a number of pens in three colours: green, red and blue.
15 of the pens are green. The number of green pens is thrice the number of red pens. What fraction of the pens is blue?
Green |
Red |
Blue |
Total |
1x3 |
4x3 |
5x3 |
3x1 |
1x1 |
|
|
3 u |
1 u |
11 u |
15 u |
Number of green pens is the repeated identity.
Make the number of green pens the same.
LCM of 1 and 3 = 3
Number of blue pens
= 15 u - 3 u - 1 u
= 11 u
Fraction of the pens that is blue
=
1115 Answer(s):
1115