PSLE Rael kept his brown and white balls in two boxes. The ratio of the number of brown to white balls in the first box was 1 : 2 and it was 1 : 6 in the second box. The two boxes contained the same number of balls. What fraction of Rael's balls were brown balls?
First box |
Second box |
1x21 21 u |
1x21 21 u |
3x7 |
7x3 |
Brown |
White |
Brown |
White |
1x7 |
2x7 |
1x3 |
6x3 |
7 u |
14 u |
3 u |
18 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 3 and 7 is 21.
Total number of brown balls
= 7 u + 3 u
= 10 u
Total number of balls
= 21 u + 21 u
= 42 u
Fraction of Rael's balls that were brown balls
=
1042 =
521 Answer(s):
521