PSLE Dana has a number of pencils in three colours: red, green and yellow.
25 of the pencils are red. The number of red pencils is thrice the number of green pencils. What fraction of the pencils is yellow?
Red |
Green |
Yellow |
Total |
2x3 |
3x3 |
5x3 |
3x2 |
1x2 |
|
|
6 u |
2 u |
7 u |
15 u |
Number of red pencils is the repeated identity.
Make the number of red pencils the same.
LCM of 2 and 3 = 6
Number of yellow pencils
= 15 u - 6 u - 2 u
= 7 u
Fraction of the pencils that is yellow
=
715 Answer(s):
715