# Cooling liquid

Cooling liquid is diluted with water in a ratio of 3:2 (3 parts by volume of coolant with 2 volumes of water). How many volumes of coolant must be prepared for a total 0.7 dm3 (liters) of the mixture?

Correct result:

x =  0.42 l

#### Solution:

$d=0.7 / (3+2)=\dfrac{ 7 }{ 50 }=0.14 \ \text{l} \ \\ x=3 \cdot \ d=3 \cdot \ 0.14=\dfrac{ 21 }{ 50 }=0.42 \ \text{l}$

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