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

If x varies inversely as y and x = 20 when y = 600, find y when x = 400.

If x varies inversely as y and y = 60 when x = 1.5. Find x. when y = 4.5.

A contractor undertook a contract to complete a part of a stadium in 9 months with a team of 560 persons. Later on, it was required to complete the job in 5 months. How many extra persons should he employ to complete the work?

Sobi types 108 words in 6 minutes. How many words would she type in half an hour?

If a deposit of Rs 2,000 earns an interest of Rs 500 in 3 years, how much interest would a deposit of Rs 36,000 earn in 3 years with the same rate of simple interest?

Find the values of x and y if a and b are in inverse proportion:

1. 12 x 8
2. 30 5 y

If a and b vary inversely to other, then find the values of p, q, r ; x, y, z and l, m, n.

If a and b vary inversely to other, then find the values of p, q, r ; x, y, z and l, m, n.

If a and b vary inversely to other, then find the values of p, q, r ; x, y, z and l, m, n.

At a particular time, the length of the shadow of Qutub Minar whose height is 72 m is 80 m. What will be the height of an electric pole, the length of whose shadow at the same time is 1000 cm?

In a hostel of 50 girls, there are food provisions for 40 days. If 30 more girls join the hostel, how long will these provisions last?

A packet of sweets was distributed among 10 children and each of them received 4 sweets. If it is distributed among 8 children, how many sweets will each child get?

The variable x is inversely proportional to y. If x increases by p%, then by what per cent will y decrease?

The perimeter of a trapezium is 52 cm and its each non-parallel side is equal to 10 cm with its height 8 cm. Its area is ______.

A trapezium with 3 equal sides and one side double the equal side can be divided into ______ equilateral triangles of ______ area.

The area of a trapezium become 4 times if its height gets doubled.

The area of a trapezium with equal non-parallel sides is 168 m². If the lengths of the parallel sides are 36 m and 20 m, find the length of the non-parallel sides.

The areas of two circles are in the ratio 49 : 64. Find the ratio of their circumferences.

Find the area of the following fields. All dimensions are in metres.

Find the area of the following fields. All dimensions are in metres.