There were some beads in Box N and Box P. After Brandon transferred
13 of the beads from Box N to Box P, the ratio of the number of beads in Box N to that in Box P changed to 1 : 7. Find the ratio of the numbers of beads in Box P to the number of beads in Box N at first.
|
Box N |
Box P |
Before |
3x1 = 3 u |
13 u |
Change |
- 1x1 = - 1 u |
+ 1 u |
After |
2x1 = 2 u |
|
Comparing Box N and Box P in the end |
1x2 = 2 u |
7x2 = 14 u |
The number of beads in Box N in the end is repeated. Make the number of beads in Box N in the end the same. LCM of 2 and 1 is 2.
At first
Box P : Box N
13: 3
Answer(s): 13: 3