Let the total work = L.C.M of 40 and 20 = 40 units Then, efficiency of ‘A’ alone = 40 ÷ 40 = 1 units/day Combined efficiency of ‘A’ and ‘B’ = 40 ÷ 20 = 2 units/day So, efficiency of ‘B’ = 2 – 1 = 1 units/day So, work done by ‘B’ alone in 30 days = 1 × 30 = 30 units So, percentage of work completed by ‘B’ = (30 ÷ 40) × 100 = 75%
Ultra-purification of metals is achieved using:
Which method is employed to separate minor quantities of multiple dissolved solids in a solution?
Which fossil fuel is formed under earth by the decomposition of vegetable matter lying under water by anaerobic bacteria in the absence of oxygen?
_____________ has the maximum attraction force between the molecules.
Which of the following reactions is a displacement reaction?
Which element is known as the 'King of Chemicals.
What is the common chemical used in blood banks as an anticoagulant and preservative?
A substance X turns the colour of red litmus blue, and it will change methyl orange-
Which of the following gas is used to fill balloons.
Which of the following is not the Ore of Aluminium?
