PSLE Barbara has a number of pencils in three colours: green, blue and brown.
411 of the pencils are green. The number of green pencils is twice the number of blue pencils. What fraction of the pencils is brown?
Green |
Blue |
Brown |
Total |
4x1 |
7x1 |
11x1 |
2x2 |
1x2 |
|
|
4 u |
2 u |
5 u |
11 u |
Number of green pencils is the repeated identity.
Make the number of green pencils the same.
LCM of 4 and 2 = 4
Number of brown pencils
= 11 u - 4 u - 2 u
= 5 u
Fraction of the pencils that is brown
=
511 Answer(s):
511