PSLE Barbara has a number of staplers in three colours: orange, yellow and red.
310 of the staplers are orange. The number of orange staplers is twice the number of yellow staplers. What fraction of the staplers is red?
Orange |
Yellow |
Red |
Total |
3x2 |
7x2 |
10x2 |
2x3 |
1x3 |
|
|
6 u |
3 u |
11 u |
20 u |
Number of orange staplers is the repeated identity.
Make the number of orange staplers the same.
LCM of 3 and 2 = 6
Number of red staplers
= 20 u - 6 u - 3 u
= 11 u
Fraction of the staplers that is red
=
1120 Answer(s):
1120