A fruit stall had 3 times as many persimmons as guavas. After 9 persimmons were added, the number of persimmons became 21 more than the number of guavas. How many guavas were there at the fruit stall at first?
| |
Persimmons |
Guavas |
| Before |
3 u |
1 u |
| Change |
+ 9 |
|
| After |
3 u + 9 |
1 u |
If another 9 guavas are added, the number of persimmons and guavas will be the same.
3 u + 9 = 1 u + 21
3 u - 1 u = 21 - 9
2 u = 12
1 u = 12 ÷ 2 = 6
Number of guavas at the fruit stall at first
= 1 u
= 6
Answer(s): 6
