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