There were some marbles in Box V and Box W. After Cody transferred
13 of the marbles from Box V to Box W, the ratio of the number of marbles in Box V to that in Box W changed to 1 : 4. Find the ratio of the numbers of marbles in Box W to the number of marbles in Box V at first.
|
Box V |
Box W |
Before |
3x1 = 3 u |
7 u |
Change |
- 1x1 = - 1 u |
+ 1 u |
After |
2x1 = 2 u |
|
Comparing Box V and Box W in the end |
1x2 = 2 u |
4x2 = 8 u |
The number of marbles in Box V in the end is repeated. Make the number of marbles in Box V in the end the same. LCM of 2 and 1 is 2.
At first
Box W : Box V
7: 3
Answer(s): 7: 3