Join 60,000+ competitive exam aspirants
A and B can do a piece of work in 6 days and 8 days, respectively. With the help of C, they completed the work in 3 days and earned ₹3,848. What was the share of C?
₹481
₹1,693
₹1,443
₹861
₹481
Calculate the ratio of efficiencies of A, B, and C. A=1/6, B=1/8, (A+B+C)=1/3. Find C's efficiency as 1/3 - (1/6 + 1/8) = 1/24. Distribute the total amount in the ratio 4:3:1.
A completes work in 6 days, B in 8 days, A+B+C in 3 days. Total earnings are ₹3,848.
ShareC=Total Earnings×EfficiencyTotalEfficiencyC
Calculate the ratio of efficiencies of A, B, and C. A=1/6, B=1/8, (A+B+C)=1/3. Find C's efficiency as 1/3 - (1/6 + 1/8) = 1/24. Distribute the total amount in the ratio 4:3:1.
Confusing 'days taken' with 'work efficiency'; remember that share is directly proportional to daily work done (efficiency), not the total days taken.
Calculate Daily Work (Efficiency)
Find the work done per day for A, B, and the group (A+B+C): EfficiencyA=1/6, EfficiencyB=1/8, EfficiencyA+B+C=1/3.
EfficiencyC=31−(61+81)
Solve for C's Efficiency
Find a common denominator (24) to calculate C's daily work: EfficiencyC=248−(244+243)=248−7=1/24.
EfficiencyC=241
Determine Ratio of Earnings
The ratio of their shares is the ratio of their daily work: A:B:C=1/6:1/8:1/24. Multiply by 24 to get the integer ratio: 4:3:1.
Ratio=4:3:1
Calculate Share of C
Sum of ratios is 4+3+1=8. Share of C is 81 of the total earnings of ₹3,848.
C=81×3848=481
A is correct because the share of C, calculated as one-eighth of the total earnings, is ₹481.
This concept of dividing money based on efficiency is identical to 'Partnership' problems in Arithmetic, where profit is shared in the ratio of capital invested multiplied by time.