Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions

Three spraying machines working together can finish painting a house in 60 minutes. How long will it take for 5 machines of the same capacity to do the same job?

A group of 3 friends staying together, consume 54 kg of wheat every month. Some more friends join this group and they find that the same amount of wheat lasts for 18 days. How many new members are there in this group now?

55 cows can graze a field in 16 days. How many cows will graze the same field in 10 days?

18 men can reap a field in 35 days. For reaping the same field in 15 days, how many men are required?

A person has money to buy 25 cycles worth Rs 500 each. How many cycles he will be able to buy if each cycle is costing Rs 125 more?

Raghu has enough money to buy 75 machines worth Rs 200 each. How many machines can he buy if he gets a discount of Rs 50 on each machine?

If x and y vary inversely as other and x = 3 when y = 8, find y when x = 4 .

If x and y vary inversely as other and x = 5 when y = 15, find x when y = 12 .

If x and y vary inversely as other and  x = 30, find y when constant of variation = 900.

If x and y vary inversely as other and y = 35, find x when constant of variation = 7.

Construct a parallelogram PQRS such that PQ = 5.2 cm, PR = 6.8 cm and QS = 8.2 cm.

Find the area, in square metres, of the trapezium whose bases and altitude is as under:
bases = 12 dm and 20 dm, altitude = 10 dm

Find the area, in square metres, of the trapezium whose bases and altitude is as under:
bases = 28 cm and 3 dm, altitude = 25 cm

Find the area, in square metres, of the trapezium whose bases and altitude is as under:
bases = 8 m and 60 dm, altitude = 40 dm

Find the area, in square metres, of the trapezium whose bases and altitude is as under:
bases = 150 cm and 30 dm, altitude = 9 dm.