The ratio of pears to starfruits is 3 : 5. If 30 starfruits are added, the ratio of pears to starfruits will be 1 : 5. How many starfruits are there?
|
Pears |
Starfruits |
Before |
3x1 = 3 u |
5x1 = 5 u |
Change |
|
+ 30 |
After |
1x3 = 3 u |
5x3 = 15 u |
The number of pears at first and in the end remains unchanged. Make the number of pears at first and in the end the same. LCM of 3 and 1 is 3.
Number of starfruits added
= 15 u - 5 u
= 10 u
10 u = 30
1 u = 30 ÷ 10 = 3
Number of starfruits
= 5 u
= 5 x 3
= 15
Answer(s): 15