PSLE Ian kept his grey and brown balls in two boxes. The ratio of the number of grey to brown balls in the first box was 1 : 5 and it was 3 : 7 in the second box. The two boxes contained the same number of balls. What fraction of Ian's balls were brown balls?
First box |
Second box |
1x30 30 u |
1x30 30 u |
6x5 |
10x3 |
Grey |
Brown |
Grey |
Brown |
1x5 |
5x5 |
3x3 |
7x3 |
5 u |
25 u |
9 u |
21 u |
The total number of balls in the first box and the second box is the same. Make the total number of balls in each box the same.
LCM of 6 and 10 is 30.
Total number of brown balls
= 25 u + 21 u
= 46 u
Total number of balls
= 30 u + 30 u
= 60 u
Fraction of Ian's balls that were brown balls
=
4660 =
2330 Answer(s):
2330