PSLE Tina has a number of pens in three colours: red, green and purple.
12 of the pens are red. The number of red pens is four times the number of green pens. What fraction of the pens is purple?
Red |
Green |
Purple |
Total |
1x4 |
1x4 |
2x4 |
4x1 |
1x1 |
|
|
4 u |
1 u |
3 u |
8 u |
Number of red pens is the repeated identity.
Make the number of red pens the same.
LCM of 1 and 4 = 4
Number of purple pens
= 8 u - 4 u - 1 u
= 3 u
Fraction of the pens that is purple
=
38 Answer(s):
38