PSLE Barbara has a number of pencils in three colours: purple, red and brown.
110 of the pencils are purple. The number of purple pencils is twice the number of red pencils. What fraction of the pencils is brown?
Purple |
Red |
Brown |
Total |
1x2 |
9x2 |
10x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
17 u |
20 u |
Number of purple pencils is the repeated identity.
Make the number of purple pencils the same.
LCM of 1 and 2 = 2
Number of brown pencils
= 20 u - 2 u - 1 u
= 17 u
Fraction of the pencils that is brown
=
1720 Answer(s):
1720