Rahul purchased two different kinds of alcohol. In the first mixture the ratio of alcohol to water is 3:4 and in the second mixture it  is 5:6. If he mixes the two given mixture and makes a third mixture of 18 litres in which the ratio of alcohol to water is 4:5, the quantity of first mixture (whose ratio is 3:4) is required to make the 18 litres of the third kind of mixture is:

From whom do teeth and bones gain strength and firmness?

Transformer is used for -

In what respect are supercomputers different from other computers?

Direction: Select the related word from the given alternatives.

6: 36 :: 9: ?

If Ahmed travels towards North from his house, then to left, then to South covering equal distances in each direction to reach Sohan's house, In which direction is Ahmed's house now?