HHow many liters of this should be drained and replaced with 100% antifreeze to get the desired strength

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Mathematics

Description

it is neccessary to have 40% antifreeze solution in the raditor of a certain car. the raditor now has 40 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength

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Explanation & Answer

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let the amount to be drained be x

amount to be left in car will be 40-x

100% x + 20% (40-x) = 40% * 40

x+ 8 - 0.2x = 16 

x-0.2x= 16-8

0.8x= 8

x= 8/0.8

x= 10 liters

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Anonymous
Just what I was looking for! Super helpful.

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