The ratio of guavas to grapefruits is 3 : 4. If 9 grapefruits are added, the ratio of guavas to grapefruits will be 3 : 7. How many less guavas than grapefruits are there in the end?
| |
Guavas |
Grapefruits |
| Before |
3 u |
4 u |
| Change |
|
+ 9 |
| After |
3 u |
7 u |
The number of guavas at first and in the end remains unchanged.
Number of grapefruits added
= 7 u - 4 u
= 3 u
3 u = 9
1 u = 9 ÷ 3 = 3
Number of less guavas than grapefruits in the end
= 7 u - 3 u
= 4 u
= 4 x 3
= 12
Answer(s): 12
