If N:38∷ 3:57, Find N.

The angle of elevation of an aeroplane from a point on the ground is 60°. After flying for 15 second, the angle of elevation changes to 30°. If the Aeroplane is flying at a height of 4500 meter, then what is the speed (in m/s) of aeroplane?

The covered surface area of  a cone of radius 8 cm and height 6 cm is double the covered surface area of a cylinder of radius 4 cm. Find the height of the cylinder?

If the ratio of the measurements of the three angles of a triangle is 2: 3: 4, then the measurement of its largest angle is.

The largest three-digit number that gives the same remainder 2 when divided by 3, 5 and 9 is ________.

Factor of $$ {ab-a-b+1}$$ is

Umesh earns a simple interest of ₹1,600 on a certain sum in two years at the rate of 4% per annum. How much more interest would he have earned if he had invested the same sum at 4% interest per annum, compounded annually?

15% of 45% of a number is 105.3 What is 24% of that number?