Question
A, B, and C can complete a job in 12, 15, and 20 days
respectively. A and B work together for 4 days, then B and C work together for 5 days. How long will it take for C to complete the remaining work alone?Solution
Work done by A in 1 day = 1/12 Work done by B in 1 day = 1/15 Work done by C in 1 day = 1/20 Work done by A and B together in 1 day = (1/12 + 1/15) = 7/60 Work done by B and C together in 1 day = (1/15 + 1/20) = 7/60 Work done by A and B together in 4 days = (7/60 × 4) = 28/60 = 7/15 Work done by B and C together in 5 days = (7/60 × 5) = 35/60 = 7/12 Total work done by A, B, and C in 9 days = 7/15 + 7/12 = 119/180 = 2/3 Remaining work = 1 - 2/3 = 1/3 Time taken by C to complete the remaining work = (1/3) / (1/20) = 20/3 = 6.67 days Correct Option: c) 6.67 days
Give below are two statements:
Statement - I: The terms of trade of a nation are defined as the ratio of the cost of its export commodity to th...
The coefficient of regression of Y on X is byx = 1.2 , If A = (X-300)/4 and C = (Y-500)/6 find bCA
Consider a Keynesian Cross Model with following features, Consumption Function: C= C0 + b (Y – T)
Tax Function: T = T0 + tY
I...
________ was an important growth strategy adopted by India prior to 1991.
Which of the following is/are true at equilibrium in a perfect competition?
(1) MR = MC
(2) AC = MC = AR = MR
(3) MC is falling
Which of the following statement is the objective(s) of setting up of Regional rural banks?
(i) development of agriculture, trade and other pr...
A firm should increase investment when :
Which of the following statements is true for a mixed economy?
Consider a Keynesian Cross Model with following features, Consumption Function: C= C0 + b (Y – T)
Tax Function: T = T0 + tY
Income...
Which of the following leads to an outward shift in the supply curve
Relevant for Exams:
