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