A hollow copper pipe is 22 cm long and its external diameter is 28 cm. If the thickness of the pipe is 3 cm and iron weighs 8.5 g/cm³ , then the weight of the pipe is closest to:

A person invests money in three different schemes for 6 years, 10 years and 12 years at 10%, 12% and 15% simple interest respectively. At the completion of each scheme, he gets the same interest. The ratio of his investments is-

If a number x is 10% less than another number y and y is 10% more than 125, then x is equal to-

A basket contains 350 eggs. If 12% of the eggs are rotten, how many eggs are good enough to be sold?

The following Charts shows the amount of grain exported (in million kg ) by a country during 2013–18.

What is the maximum per cent more than the minimum export in the given period?

The mean of the first 7 prime numbers is:

Two students appeared for an examination. One student who scored 20 marks more than the other, his score was 60 % of the sum of their marks. What was his score?

In a group of 15 women, 7 have nose studs, 8 have ear rings and 3 have neither. How many of these have both nose studs and ear rings?