A barrel contained 4.5 ℓ more water than a bottle. After some water was poured from the barrel to the bottle, both the barrel and the bottle had 7 ℓ of water each. How much water was there in the bottle at first?
|
Barrel |
Bottle |
Total |
Before |
1 u + 4.5 |
1 u |
14 |
Change |
- ? |
+ ? |
|
After |
7 |
7 |
14 |
Volume of water in the bottle = 1 u
Volume of water in the barrel = 1 u + 4.5
Total volume of water
= 1 u + 1 u + 4.5
= 2 u + 4.5
Total volume of water
= 2 x 7
= 14 ℓ
When water is poured from the barrel to the bottle, the total volume remains unchanged.
2 u + 4.5 = 14
2 u = 14 - 4.5
2 u = 9.5
1 u = 9.5 ÷ 2 = 4.75
Volume of water in the bottle at first = 4.75 ℓ
Answer(s): 4.75 ℓ