Question
"A" can finish a task by himself in 30 days. "B" is
twice as efficient as "C" and three times more efficient than "A". If "A" and "C" begin the task together, after how many days should "B" take over to ensure the task is completed in precisely 11 days?Solution
Let the total work be 60 units. So, efficiency of 'A' = 60 ÷ 30 = 2 units/day So, efficiency of 'B' = 3 X 2 = 6 units/day And efficiency of 'C' = 6 ÷ 2 = 3 units/day Let the number of days for which 'B' worked alone be 'd'. So, (d X 6) + (11 - d) X (2 + 3) = 60 Or, 6d + 55 - 5d = 60 Or, 'd' = 5 So, 'B' worked alone for 5 days So, 'B' should've joined them after (11 - 5) = 6 days
Select the figure from the given options that will come next in the following figure series.
Select the figure from among the given options that can replace the question mark (?) in the following series.
Find the option which is related to the third figure in the same way as the second figure is related to the first figure. (The first figure is the leftm...
Each of the following questions consists of two sets of figures. Figures A, B, C and D constitute the Problem Set while figures (1), (2), (3) and (4) c...
In each of the following questions which one of the answer figures shall complete the given question figure.
Find the question mark ? figure from answer figure.
Which of the given figures when placed in the 5th position would continue the series that is established by the first four figures?
Each of the following questions consists of two sets of figures. Figures A, B, C and D constitute the Problem Set while figures (1), (2), (3) and (4) c...
Select the figure which will come next in the following figure series.
Select the figure from the options that can replace the question mark (?) in the following series.
Relevant for Exams:
