A fruit stall had 5 times as many peaches as starfruits. After 9 peaches were added, the number of peaches became 21 more than the number of starfruits. How many starfruits were there at the fruit stall at first?
| |
Peaches |
Starfruits |
| Before |
5 u |
1 u |
| Change |
+ 9 |
|
| After |
5 u + 9 |
1 u |
If another 9 starfruits are added, the number of peaches and starfruits will be the same.
5 u + 9 = 1 u + 21
5 u - 1 u = 21 - 9
4 u = 12
1 u = 12 ÷ 4 = 3
Number of starfruits at the fruit stall at first
= 1 u
= 3
Answer(s): 3
