If a : b = c : d, then $$\frac{{{\text{ma}} + {\text{nc}}}}{{{\text{mb}} + {\text{nd}}}}$$   is equal to -

If a : b = 2 : 3 and b : c = 4 : 5, then (a + b) : (b + c) is equal to-

A container contains two liquids A and B in the ratio 7 : 5. When 9 litres of mixture are drawn off and the container is…

A mixture contains spirit and water in the ratio of 3 : 2. If it contains 3 litres more spirit than water, the quantity …

The fourth proportional to 5, 8, 15 is:

In an innings of a cricket match,three players A, B and C scored a total of 361 runs. If the ratio of the number of runs…

Suppose y varies as the sum of two quantities of which one varies directly as x and the other inversely as x. If y = 6 w…

The falling height of an object is proportional to the square of the time. One object falls 64 cm in 2 sec then in 6 sec…