PSLE Sarah has a number of pencils in three colours: green, blue and red.
18 of the pencils are green. The number of green pencils is four times the number of blue pencils. What fraction of the pencils is red?
Green |
Blue |
Red |
Total |
1x4 |
7x4 |
8x4 |
4x1 |
1x1 |
|
|
4 u |
1 u |
27 u |
32 u |
Number of green pencils is the repeated identity.
Make the number of green pencils the same.
LCM of 1 and 4 = 4
Number of red pencils
= 32 u - 4 u - 1 u
= 27 u
Fraction of the pencils that is red
=
2732 Answer(s):
2732