Two bags of iron ore weight 180 kg 250 gm and 270 kg 50 gm respectively. How much iron ore (in gm) must be taken out from the first bag and added to the second bag so that weight of the first bag may then be two-third of the second bag ?

The ratio of the rate of flow of water through pipes varies inversely, as the square of the radius of the pipes. What is the ratio of the rates of flow in two pipes of diameter 2 cm and 4 cm?

The sum of three numbers is $136$. If the ratio between the first number and the second number is $2 : 3$ and that between the second and the third number is $5 : 3$, then the first number is:

The mean proportional between 0.08 and 0.18 is?

A sum of Rs. 1250 is divided among A, B and C such that A gets $\frac{2}{9}$ of B's share and C gets $\frac{3}{4}$ of A's share. Find the shares of A, B and C (in Rs.).

A is younger than B by 7 years. If their ages are in the respective ratio of 7 : 9 then how old is A?

A, B and C started a business by investing Rs. 40,000, Rs. 50,000 and Rs. 60,000 respectively. After 8 months B withdrew Rs. 10,000. After one more month C withdrew Rs. 40,000. Find the ratio in which profit earned at the end of the year will be distributed.