PSLE Usha has a number of pens in three colours: blue, green and brown.
511 of the pens are blue. The number of blue pens is twice the number of green pens. What fraction of the pens is brown?
Blue |
Green |
Brown |
Total |
5x2 |
6x2 |
11x2 |
2x5 |
1x5 |
|
|
10 u |
5 u |
7 u |
22 u |
Number of blue pens is the repeated identity.
Make the number of blue pens the same.
LCM of 5 and 2 = 10
Number of brown pens
= 22 u - 10 u - 5 u
= 7 u
Fraction of the pens that is brown
=
722 Answer(s):
722