Question
βPβ, βQβ, and βRβ can
complete a task in 10 days, 15 days, and 20 days, respectively. βPβ starts the task alone and is joined by βQβ on the second day. On the third day, βQβ is replaced by βRβ, and again on the fourth day, βPβ works alone. The process repeats in the same manner. Find the total time taken to complete the task. (Round off to two decimal places)Solution
ATQ,
Let the total work be the LCM of [10, 15, 20] = 60 units. Efficiency of βPβ = 60/10 = 6 units/day. Efficiency of βQβ = 60/15 = 4 units/day. Efficiency of βRβ = 60/20 = 3 units/day. Work done on the first day = 6 Γ 1 = 6 units. Work done on the second day = (6 + 4) Γ 1 = 10 units. Work done on the third day = (6 + 3) Γ 1 = 9 units. Total work done in the first three days = 6 + 10 + 9 = 25 units. Remaining work = 60 β 25 = 35 units. Time taken to complete the remaining work = (6/6) + (10/10) + (9/9) + (10/17) β 3 + (10/17) β 3.59 days. Total time = 3 + 3.59 = 6.59 days.
What number should replace the question mark?Β
In each of the following questions select the related letter/word/figure/number from the given alternatives.
JRH : ? : : KOV : 51Β
Select the number from among the given option that can replace the question mark (?) in the following series.
6, 31, 126, 381, 766, ?
Study the given pattern carefully and select the number that can replace the question mark (?) in it.
First row: 14, 12, 108
Second row:...
Find the missing number?
What will come in the place of question mark?
Select the number from the given option that can replace the question mark (?) in the following series:
32, 16, 24, 60, ?, 945
Study the given matric carefully and select the number from among the given options that can replace the question mark (?) in it.
Select the option that is related to the third number in the same way as the second number is related to the first number.
15 : 5 :: 26 : (?)
Find the missing number by analysing the pattern followed by the numbers in each row.
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