SOLUTION: As a lab assistant I need to make a 3:4 mixture of acid and water for cleaning. The supervisor needs 25L made up. How many litre of phosphoric acid do you require?

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Question 883747: As a lab assistant I need to make a 3:4 mixture of acid and water for cleaning. The supervisor needs 25L made up. How many litre of phosphoric acid do you require?
Found 2 solutions by lwsshak3, josgarithmetic:
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
As a lab assistant I need to make a 3:4 mixture of acid and water for cleaning. The supervisor needs 25L made up. How many litre of phosphoric acid do you require?
***
let x=amt of acid required
25-x=amt of water required
x%2F%2825-x%29=3%2F4
4x=75-3x
7x=75
x=75/7=10.7
amt of acid required=10.7 litres

Answer by josgarithmetic(39631) About Me  (Show Source):
You can put this solution on YOUR website!
Three parts to four parts, 3:4, means a total count of seven parts.
3 parts acid plus 4 parts water.

Acid, %283%2F7%29%2A25 liters
Water, %284%2F7%29%2A25 liters