A man had ₹ 16,000, part of which he lent at 4% and the rest at 5% per annum simple interest. If the total interest received was 700 in one year, the money lent at 4% per annum was

The average of 30 numbers is 40 and that of the other 40 numbers is 30. The average of all the numbers is-

If the duty on an article is reduced by 40% of its present rate by how much per cent must its consumption increase in order that the revenue remains unaltered?

In what time will ₹8000, at 3% per annum, produce the same interest as ₹6000 does in 5 years at 4% simple interest is? 

Directions : The Bar Graph given here shows the population (in crores) of India in various census years. Observe the graph and answer the question based on it.

The per cent increase in population from 1971 to 1981 is

Directions : Read the graph and answer the following questions.

Percentage increase in profit in 1986 over 1982 is

Find the area of the triangle whose sides are 5 cm, 12 cm and 13 cm.

△ABC ∼ △DEF. If the areas of △ABC and △DEF are 100 cm² and 81 cm², respectively and the altitude of △DEF is 6.3 cm, then the corresponding altitude of △ABC is: