The diameter of the base of a cylindrical drum is 21 dm and the height is 12 dm. It is full of petrol. How many tins each of size 15 cm × 11 cm × 20 cm can be filled with petrol from the drum?

What is the present age of Rina?

I. Rina’s present age is `1/10` of her mother’s present age.

Find the area of a rhombus.

A. Sum of the squares of the diagonals is 256 m².

B. Perimeter of the rhombus is 32 m.

What is the cost of fencing a rectangular plot?

I. The length of the plot is thrice its breadth.

Find the rate of interest per annum ?

I. The CI in 12 years is more than the amount.

What is the present age of mother?

I. The difference between the ages of mother and daughter is 45 years.

How many boys are there in the class?

I. The number of girls is 30% of the number of boys.

II. The ratio of the number of boys to that of girls is 3:5.

What is the speed of a train?

I. The train crosses a pole in 24 seconds.

II. The train crosses a platform of equal length in 48 seconds.

How old is Jack?

I. After 20 years, Jack will be twice as old as he is today.

II. Five years ago, Jack was ¾ times of his present age.

What will be the percentage increase in the volume?

Statement I : A cube of ice is dip into 20 litre water