PSLE Erika has a number of staplers in three colours: blue, red and yellow.
15 of the staplers are blue. The number of blue staplers is twice the number of red staplers. What fraction of the staplers is yellow?
Blue |
Red |
Yellow |
Total |
1x2 |
4x2 |
5x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
7 u |
10 u |
Number of blue staplers is the repeated identity.
Make the number of blue staplers the same.
LCM of 1 and 2 = 2
Number of yellow staplers
= 10 u - 2 u - 1 u
= 7 u
Fraction of the staplers that is yellow
=
710 Answer(s):
710