# Moderate Ratios & Proportion Solved QuestionAptitude Discussion

 Q. $A$, $B$ and $C$, each of them working alone can complete a job in 6, 8 and 12 days respectively. If all three of them work together to complete a job and earn Rs.2340, what will be $C$’s share of the earnings?
 ✔ A. Rs.520 ✖ B. Rs.1080 ✖ C. Rs.1170 ✖ D. Rs.630

Solution:
Option(A) is correct

$A$, $B$ and $C$ will share the amount of Rs. 2340 in the ratio of the amounts of work done by them.

As $A$ takes 6 days to complete the job, if $A$ works alone, $A$ will be able to complete $\dfrac{1}{6}$ th of the work in a day.

Similarly, $B$ will complete $\dfrac{1}{8}$ th and $C$ will complete $\dfrac{1}{12}$  th of the work.
So, the ratio of the work done by $A:B:C$ when they work together will be equal to $\dfrac{1}{6}, \dfrac{1}{8}, \dfrac{1}{12}$

Multiplying the numerator of all 3 fractions by 24, the LCM of 6, 8 and 12 will not change the relative values of the three values

We get $\dfrac{24}{6}, \dfrac{24}{8}, \dfrac{24}{12}=4:3:2$

i.e., the ratio in which $A:B:C$ will share Rs.2340 will be $4:3:2$.

Hence, $C$’s share will be $\dfrac{2}{9}\times 2340=\text{Rs }520$

Anonymouse
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520