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Time & Work · Question 48 of 61

Question 48

EasyOriginal question

An outlet can empty a full swimming-pool tank in 18 minutes. What fraction of the water is still in the tank after the outlet has run for 6 minutes?

\frac{1}{18}

Correct answerYour answer

\frac{1}{3}

Correct answerYour answer

\frac{1}{2}

Correct answerYour answer

\frac{2}{3}

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer D

Correct answer: D

In 6 minutes the outlet removes $\frac{6}{18} = \frac{1}{3}$ of the water.
Water left = $1 - \frac{1}{3} = \frac{2}{3}$ .

Worth noting

$\frac{1}{3}$ is the fraction drained, not the fraction left.

Concept: Fraction remaining after emptying
Typical timeTypical: 40 s
Your timeYours: —

The rule this testsPipes and cisterns

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