PSLE Kathy has a number of pens in three colours: blue, purple and brown.
711 of the pens are blue. The number of blue pens is four times the number of purple pens. What fraction of the pens is brown?
Blue |
Purple |
Brown |
Total |
7x4 |
4x4 |
11x4 |
4x7 |
1x7 |
|
|
28 u |
7 u |
9 u |
44 u |
Number of blue pens is the repeated identity.
Make the number of blue pens the same.
LCM of 7 and 4 = 28
Number of brown pens
= 44 u - 28 u - 7 u
= 9 u
Fraction of the pens that is brown
=
944 Answer(s):
944