The ratio of grapefruits to persimmons is 5 : 7. If 20 persimmons are added, the ratio of grapefruits to persimmons will be 5 : 11. How many less grapefruits than persimmons are there in the end?
| |
Grapefruits |
Persimmons |
| Before |
5 u |
7 u |
| Change |
|
+ 20 |
| After |
5 u |
11 u |
The number of grapefruits at first and in the end remains unchanged.
Number of persimmons added
= 11 u - 7 u
= 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Number of less grapefruits than persimmons in the end
= 11 u - 5 u
= 6 u
= 6 x 5
= 30
Answer(s): 30
