PSLE Erika has a number of pens in three colours: purple, brown and red.
18 of the pens are purple. The number of purple pens is twice the number of brown pens. What fraction of the pens is red?
Purple |
Brown |
Red |
Total |
1x2 |
7x2 |
8x2 |
2x1 |
1x1 |
|
|
2 u |
1 u |
13 u |
16 u |
Number of purple pens is the repeated identity.
Make the number of purple pens the same.
LCM of 1 and 2 = 2
Number of red pens
= 16 u - 2 u - 1 u
= 13 u
Fraction of the pens that is red
=
1316 Answer(s):
1316