The ratio of guavas to starfruits is 5 : 7. If 63 starfruits are added, the ratio of guavas to starfruits will be 2 : 7. How many starfruits are there?
|
Guavas |
Starfruits |
Before |
5x2 = 10 u |
7x2 = 14 u |
Change |
|
+ 63 |
After |
2x5 = 10 u |
7x5 = 35 u |
The number of guavas at first and in the end remains unchanged. Make the number of guavas at first and in the end the same. LCM of 5 and 2 is 10.
Number of starfruits added
= 35 u - 14 u
= 21 u
21 u = 63
1 u = 63 ÷ 21 = 3
Number of starfruits
= 14 u
= 14 x 3
= 42
Answer(s): 42