There were some coins in Box A and Box B. After Andy transferred
35 of the coins from Box A to Box B, the ratio of the number of coins in Box A to that in Box B changed to 1 : 5. Find the ratio of the numbers of coins in Box A to the number of coins in Box B at first.
| |
Box A |
Box B |
| Before |
5x1 =
5 u |
7 u |
| Change |
- 3x1 =
- 3 u |
+ 3 u |
| After |
2x1 =
2 u |
|
Comparing Box A and
Box B in the end |
1x2 =
2 u |
5x2 =
10 u |
The number of coins in Box A in the end is repeated. Make the number of coins in Box A in the end the same. LCM of 2 and 1 is 2.
At first
Box A : Box B
5 : 7
Answer(s): 5 : 7
