Ratio: Miscellaneous Exercises on Ratio and its Properties

The video tutorial explains how to find the number of girls in a school given the ratio of girls to boys and the actual number of boys. The ratio is 3:4, and the number of boys is 140. By multiplying the ratio of girls (3) by the number of boys (140) and dividing by the ratio of boys (4), the number of girls is calculated to be 105. The tutorial also generalizes this method for finding unknown quantities when given a ratio and one real value.

What is the given ratio of girls to boys in the school?

• 2 to 3

• 1 to 2

• 4 to 5

• 3 to 4

If the number of boys is 140, how many girls are there in the school?

• 100

• 115

• 105

• 110

What is the first step to find the number of girls using the given ratio?

• Divide the number of boys by 3

• Multiply the number of boys by 3

• Multiply the number of boys by 4

• Add the ratio numbers

What should you do after multiplying the number of boys by 3 to find the number of girls?

• Add 4

• Subtract 4

• Divide by 4

• Multiply by 4

What can you determine if you know the ratio between two quantities and the real value of one?

• The ratio of another pair of quantities

• The sum of the two quantities

• The real value of the other quantity

• The difference between the two quantities