PSLE Anna has a number of pens in three colours: blue, brown and purple.
13 of the pens are blue. The number of blue pens is four times the number of brown pens. What fraction of the pens is purple?
Blue |
Brown |
Purple |
Total |
1x4 |
2x4 |
3x4 |
4x1 |
1x1 |
|
|
4 u |
1 u |
7 u |
12 u |
Number of blue pens is the repeated identity.
Make the number of blue pens the same.
LCM of 1 and 4 = 4
Number of purple pens
= 12 u - 4 u - 1 u
= 7 u
Fraction of the pens that is purple
=
712 Answer(s):
712