Arithmetic

If x/y = 4/5, find (5x-3y) : (5x+3y).

What is the ratio of the volume of a cylinder to a cone of same height and radius?

The ratio of two numbers is 5:9. If 10 is subtracted from each, the ratio becomes 5:11. The numbers are:

If a:b = 2:3 and b:c = 5:7, find the triplicate ratio of a:c.

Find the ratio of the area of a circle to its circumference.

In a mixture of 30L, ratio of milk and water is 7:3. How much water is added to make it 3:7?

If (x+y):(x-y) = 4:1, find (x^2+y^2):(x^2-y^2).

A certain amount is divided in ratio 2:3:5. If the smallest part is 50, find the largest part.

Find x if 2, 4, x, 12 are in proportion? No, let's use 2:4 :: 6:x.

If 3A = 4B = 5C, find A:C.

What is 20% of 150?

Express 1/4 as a percentage.

What percent of 80 is 20?

If 10% of a number is 50, what is the number?

Convert 0.05 into a percentage.

What is 150% of 40?

Calculate 5% of 200.

Which of the following is equivalent to 75%?

What is 10% of 10% of 100?

If a student scores 40 out of 50, what is the percentage?