The number of apples is 3 times as many as the number of pineapples. After buying another 10 apples and 30 pineapples, the number of apples is the same as the number of pineapples. What is the number of apples at first?
| |
Apples |
Pineapples |
| Before |
3 u |
1 u |
| Change |
+ 10 |
+ 30 |
| After |
3 u + 10 |
1 u + 30 |
The number of apples and pineapples is the same in the end.
3 u + 10 = 1 u + 30
3 u - 1 u = 30 - 10
2 u = 20
1 u = 20 ÷ 2 = 10
Number of apples at first
= 3 u
= 3 x 10
= 30
Answer(s): 30
