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Let the total work = 300 units Then, efficiency of ‘A’ = (300/40) = 7.5 units/hour Work completed by ‘A’ alone in 20 hours = 7.5 × 20 = 150 units Remaining work = 300 – 150 = 150 units So, efficiency of ‘B’ = 150/20 = 7.5 units/hour Therefore, combined efficiency of ‘A’ and ‘B’ = 7.5 + 7.5 = 15 units/hour So, time taken by ‘A’ and ‘B’ together to complete the work = (300/15) = 20 hours
What will come in the place of question mark?
2, 5, 11, 23, ?
Select the number that will replace the question mark (?) in the following series.
35, 38, 43, 50, 61, 74, ?
Select the related number from the given alternatives.
29 : 65 : : 43 : ?
Select the missing number from the given alternatives:
Find the missing number by analysing the pattern followed by the numbers in each row.
Find the missing number by analysing the pattern followed by the numbers in each row.
What number should replace the question mark?
Insert the correct missing number from the choices given below: