Question 1114736: How many liters of pure concentrate should be added to 10 liters of 20% concentrate to make a 50% concentrate punch? Answer by ikleyn(52784) (Show Source):
= 0.5 <<<---=== it is the "concentration" equation
2 + x = 0.5*(10+x)
2 + x = 5 + 0.5x
x - 0.5x = 5 - 2
0.5x = 3 ====> x = = 6.
Answer. 6 liters of the pure concentrate should be added.
Check. = = 0.5. ! Correct !
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