Question
‘A’ and ‘B’ can do a piece of work in 30 days
and 40 days, respectively. They started working together but ‘A’ left after 9 days. Find the time taken by ‘B’ to complete the remaining work.Solution
Let total amount of work be 120 units (LCM of 30 and 40). Efficiency of ‘A’ = 120/30 = 4 units/day Efficiency of ‘B’ = 120/40 = 3 units/day Amount of work done by ‘A’ and ‘B’ together in 9 days = (4 + 3) × 9 = 63 units Time taken by B to complete remaining work = {(120 – 63)/3} = 19 days
Solve : (3.2 × 104) ÷ (2 × 105)
The sum of three positive numbers is 18 and their product is 162. If the sum of two numbers is equal to the third then the sum of squares of the numbers is
In an election two candidates participates. 20% voters did not vote. 25 % votes declared invalid and the winner get 80 % of the valid votes. If he win b...
Due to 25% fall in the rate of eggs, one can buy 2 dozen eggs more than before by investing Rs.162. Then the original rate per dozen of the eggs is
If a dozen apples weigh 1.8 kg in total, how many apples will be there in 3 boxes weighing 23.250 kg each?
906 ___ 6 ___ `sqrt1225` ___ 500 ___ 850 = 4,935
A box contains 6 blue shirts, 7 yellow shirts and 9 pink shirts. In how many ways can 4 shirts be drawn from the box, if at least one blue shirt, one ye...
69,012 ___ 20,167 ___ 51,246 ___ 6 ___ 50,000 = 7,386
Relevant for Exams:
