PSLE Rachel has a number of markers in three colours: orange, brown and red.
15 of the markers are orange. The number of orange markers is twice the number of brown markers. What fraction of the markers is red?
Orange |
Brown |
Red |
Total |
1x2 |
4x2 |
5x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
7 u |
10 u |
Number of orange markers is the repeated identity.
Make the number of orange markers the same.
LCM of 1 and 2 = 2
Number of red markers
= 10 u - 2 u - 1 u
= 7 u
Fraction of the markers that is red
=
710 Answer(s):
710