PSLE Shiyun has a number of staplers in three colours: yellow, brown and purple.
57 of the staplers are yellow. The number of yellow staplers is thrice the number of brown staplers. What fraction of the staplers is purple?
Yellow |
Brown |
Purple |
Total |
5x3 |
2x3 |
7x3 |
3x5 |
1x5 |
|
|
15 u |
5 u |
1 u |
21 u |
Number of yellow staplers is the repeated identity.
Make the number of yellow staplers the same.
LCM of 5 and 3 = 15
Number of purple staplers
= 21 u - 15 u - 5 u
= 1 u
Fraction of the staplers that is purple
=
121 Answer(s):
121