PSLE Harry kept his purple and green buttons in two boxes. The ratio of the number of purple to green buttons in the first box was 1 : 4 and it was 3 : 7 in the second box. The two boxes contained the same number of buttons. What fraction of Harry's buttons were purple buttons?
First box |
Second box |
1x10 10 u |
1x10 10 u |
5x2 |
10x1 |
Purple |
Green |
Purple |
Green |
1x2 |
4x2 |
3x1 |
7x1 |
2 u |
8 u |
3 u |
7 u |
The total number of buttons in the first box and the second box is the same. Make the total number of buttons in each box the same. LCM of 5 and 10 is 10.
Total number of purple buttons
= 2 u + 3 u
= 5 u
Total number of buttons
= 10 u + 10 u
= 20 u
Fraction of Harry's buttons that were purple buttons
=
520 =
14 Answer(s):
14