النسبة: تدريبات متنوعة على النسبة وخواصها

A group of friends at school discusses how to find the number of girls based on given information. They know the ratio of girls to boys is 3:4, and there are 140 boys. The video explains how to calculate the number of girls using this ratio, resulting in 105 girls. It concludes by generalizing the method for finding unknown quantities when given a ratio and one known value.

What question did one of the friends ask during recess?

• How many classes are there?

• Can you guess the number of girls in the school?

• How many teachers are in the school?

• What is the total number of students?

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

• 4 to 3

• 2 to 3

• 3 to 4

• 1 to 2

How many boys are there in the school according to the information given?

• 140

• 160

• 120

• 180

How do you calculate the number of girls using the given ratio and number of boys?

• Multiply 3 by 140 and divide by 4

• Multiply 4 by 140 and divide by 3

• Add 3 and 140 and divide by 4

• Subtract 3 from 140 and multiply by 4

What is the final calculated number of girls in the school?

• 115

• 110

• 105

• 100