The ratio of chikoos to persimmons is 2 : 5. If 81 persimmons are added, the ratio of chikoos to persimmons will be 1 : 7. How many chikoos are there?
|
Chikoos |
Persimmons |
Before |
2x1 = 2 u |
5x1 = 5 u |
Change |
|
+ 81 |
After |
1x2 = 2 u |
7x2 = 14 u |
The number of chikoos at first and in the end remains unchanged. Make the number of chikoos at first and in the end the same. LCM of 2 and 1 is 2.
Number of persimmons added
= 14 u - 5 u
= 9 u
9 u = 81
1 u = 81 ÷ 9 = 9
Number of chikoos
= 2 u
= 2 x 9
= 18
Answer(s): 18