The ratio and its properties to solve real life problems.

In this video, students are challenged to find the number of girls in a school using a given ratio of girls to boys, which is 3 to 4, and the known number of boys, 140. The video demonstrates how to solve this problem by multiplying the ratio of girls by the number of boys and dividing by the ratio of boys. The solution reveals there are 105 girls. The video concludes by explaining how this method can be applied to other problems involving ratios and known quantities.

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

• 5 to 6

• 4 to 5

• 3 to 4

• 2 to 3

If the number of boys is 140, how do you calculate the number of girls using the ratio?

• Multiply 4 by 140 and divide by 3

• Multiply 3 by 140 and divide by 4

• Multiply 140 by 3 and add 4

• Multiply 140 by 4 and subtract 3

What is the actual number of girls in the school?

• 100

• 105

• 115

• 110

What is the first step in finding the real value of a quantity when given a ratio and the real value of another quantity?

• Divide the known value by the ratio number of the unknown quantity

• Subtract the ratio numbers from each other

• Multiply the known value by the ratio number of the unknown quantity

• Add the ratio numbers together

What should you do after multiplying the known value by the ratio number of the unknown quantity?

• Multiply the result by the ratio number of the known quantity

• Add the ratio numbers together

• Divide the result by the ratio number of the known quantity

• Subtract the ratio numbers from each other