Question
‘X’ is 25% more efficient than ‘Y’, and ‘Z’
is 25% less efficient than ‘Y’. Together, they can complete a job in 40 days. If X and Y work together for 30 days, how long will Z take to finish the remaining work?Solution
Let efficiency of ‘Y’ be ‘x’ units/day Efficiency of ‘X’ = 1.25x units/day Efficiency of ‘Z’ = 0.75x units/day Total work = (1.25x + x + 0.75x) × 40 = 120x units Work done by X and Y in 30 days = 30 × (1.25x + x) = 67.5x units Remaining work = 120x – 67.5x = 52.5x units Time taken by Z = 52.5x ÷ 0.75x = 70 days
Never before (a)/ the students of India have so much been frustrated (b)/ as today when the problems of unemployment are dominant. (c)/ No error (d)
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Between you and I (A)/ he probably won’t (B)/ come at all (C)/ No Error (D).
Angered over the delay in giving compensation; factory workers shouted slogans against the president when he reaches the office.
Rapid urbanisation has leading to the migration of men folk from the village to cities in search of work.
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The author’s new book which is about economical change will launched soon.
He pointed out that (1) / there was none (2) / alligation against (3) / the Chief Minister for (4) / the state (5).
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