If 80 litres of milk solution has 60% milk in it, then how much milk should be added to make milk 80% in the solution?

A pyramid has an equilateral triangle as its base, of which each side is 8 cm. Its slant edge is 24 cm. The whole surface area of the pyramid (in cm²) is:

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
20 * 2 * 50 * 5 * 115

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
 23 * 2 * 2 * 5 * 18

Directions : In which answer figure is the question figure embedded?

Question figure.

Four clusters have been given out of which three are alike in some manner and one is different. Select the one that is different.

Option

Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster.
 EACH : AEHC :: GAME : AGEM :: IDOL : ?

Select the number from among the given options that can replace the question mark (?) in the following series. 

Question figure.