The ratio of pears to starfruits is 2 : 7. If 20 starfruits are added, the ratio of pears to starfruits will be 2 : 9. How many more starfruits than pears are there in the end?
| |
Pears |
Starfruits |
| Before |
2 u |
7 u |
| Change |
|
+ 20 |
| After |
2 u |
9 u |
The number of pears at first and in the end remains unchanged.
Number of starfruits added
= 9 u - 7 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Number of more starfruits than pears in the end
= 9 u - 2 u
= 7 u
= 7 x 10
= 70
Answer(s): 70
