Average earning of a mechanic for first four days of a week is Rs.,18 and for last four days is Rs.,

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The average earning of a mechanic for the first four days of a week is $Rs.\,18$ and for the last four days is $Rs.\,22.$ If he earns $Rs.\, 20$ on the fourth day, his average earning for the whole week is (in $Rs.$)

A

$18.95$

B

$16$

C

$20$

D

$25.71$

Solution

Total earning for the week

$=Rs.\,(4 \times 18+4 \times 22-20)=Rs.\, 140$

$\therefore \quad$ Average eaming $=Rs.\, \frac{140}{7}=Rs.\, 20$

Standard 13

Quantitative Aptitude

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