The ratio of starfruits to persimmons is 3 : 4. If 15 persimmons are added, the ratio of starfruits to persimmons will be 3 : 7. How many more persimmons than starfruits are there in the end?
| |
Starfruits |
Persimmons |
| Before |
3 u |
4 u |
| Change |
|
+ 15 |
| After |
3 u |
7 u |
The number of starfruits at first and in the end remains unchanged.
Number of persimmons added
= 7 u - 4 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Number of more persimmons than starfruits in the end
= 7 u - 3 u
= 4 u
= 4 x 5
= 20
Answer(s): 20
