PSLE Lucy has a number of pens in three colours: red, yellow and blue.
18 of the pens are red. The number of red pens is twice the number of yellow pens. What fraction of the pens is blue?
Red |
Yellow |
Blue |
Total |
1x2 |
7x2 |
8x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
13 u |
16 u |
Number of red pens is the repeated identity.
Make the number of red pens the same.
LCM of 1 and 2 = 2
Number of blue pens
= 16 u - 2 u - 1 u
= 13 u
Fraction of the pens that is blue
=
1316 Answer(s):
1316