PSLE Anna has a number of pens in three colours: orange, blue and purple.
29 of the pens are orange. The number of orange pens is four times the number of blue pens. What fraction of the pens is purple?
Orange |
Blue |
Purple |
Total |
2x2 |
7x2 |
9x2 |
4x1 |
1x1 |
|
|
4 u |
1 u |
13 u |
18 u |
Number of orange pens is the repeated identity.
Make the number of orange pens the same.
LCM of 2 and 4 = 4
Number of purple pens
= 18 u - 4 u - 1 u
= 13 u
Fraction of the pens that is purple
=
1318 Answer(s):
1318