A 40-litre mixture is 80% milk. 10 litres of it are taken out and replaced with water. What percentage of the mixture is milk now?

55%Correct answerYour answer60%Correct answerYour answer

\frac{200}{3}

%Correct answerYour answer70%Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer B

Correct answer: B

Milk now: 32 litres. The 10 litres taken out are a quarter of the mixture, so they take a quarter of the milk, 8 litres.
$\frac{32 - 8}{40} = \frac{24}{40} = 60\%$ .

Worth noting

55% takes all 10 litres out of the milk, as if the mixture were pure milk.

Ten questions from Alligation & Mixtures, at your own pace.

Ten questions from Alligation & Mixtures, at your own pace.

Explanation