Govt. Exams
Entrance Exams
CP per banana = 30/12 = 2.5. SP per banana = 3. Profit = 0.5. Percentage = (0.5/2.5) × 100 = 20%
Let original = x. x × 1.15 = 299. x = 299/1.15 = 260
Fill rate = 1/20, Drain rate = 1/30. Net rate = 1/20 - 1/30 = 3/60 - 2/60 = 1/60. Time = 60 minutes
A = P(1 + r/100)^n = 10000(1.1)^2 = 10000 × 1.21 = 12100. CI = 12100 - 10000 = ₹2100
SI = (P × R × T)/100 = (5000 × 8 × 2.5)/100 = 100000/100 = ₹1000
Upstream speed = 15-3 = 12 km/h. Downstream speed = 15+3 = 18 km/h. Time upstream = 36/12 = 3 hours. Time downstream = 36/18 = 2 hours. Total = 5 hours
Profit = 25% of 800 = 200. Selling Price = 800 + 200 = ₹1000
Total distance = 240 + 360 = 600m. Time = 30 seconds. Speed = 600/30 = 20 m/s = 20 × 3.6 = 72 km/h
60% work is done in 9 days.
Rate = 0.6/9 = 1/15 per day.
Total days = 1/(1/15) = 15 days
This question tests the concept of inverse proportionality between the number of workers and the time required to complete a fixed task.
Work is constant regardless of the number of workers, so we multiply workers by days.
With 10 workers, the same 40 worker-days of work must be completed.
Divide total work by the number of workers to find days required.
When 10 workers work together, they will build the same wall in 4 days.
