Class Composition and Ratios

The video tutorial explains how to solve a problem involving the ratio of boys to girls in a class of 28 students. It begins by setting up a proportional statement based on the given ratio of 3:4. The tutorial then calculates the scale factor needed to adjust this ratio to the total number of students. By multiplying the original ratio by the scale factor, the number of boys and girls is determined to be 12 and 16, respectively. The video emphasizes the importance of verifying the solution to ensure accuracy.

What is the total number of students in the class?

• 28

• 12

• 16

• 7

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

What is the given ratio of boys to girls?

• 4:3

• 3:4

• 1:2

• 2:3

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

What is the sum of the parts in the ratio 3:4?

• 7

• 4

• 28

• 3

Tags

CCSS.7.RP.A.2C

What is the scale factor used to adjust the ratio to the actual number of students?

• 3

• 2

• 5

• 4

Tags

CCSS.7.RP.A.2C

How do you calculate the number of boys using the scale factor?

• Multiply 4 by 3

• Subtract 3 from 4

• Multiply 3 by 4

• Add 3 and 4

Tags

CCSS.1.NBT.A.1

How many boys are there in the class?

• 16

• 12

• 28

• 7

Tags

CCSS.1.NBT.A.1

How many girls are there in the class?

• 16

• 7

• 28

• 12

Tags

CCSS.1.NBT.A.1

What is the total number of students when you add the number of boys and girls?

• 12

• 16

• 28

• 7

Tags

CCSS.RL.6.10

CCSS.RF.5.4B

CCSS.RI.7.10

CCSS.RF.5.4A

CCSS.RF.5.4C

Why is it important to check your answer?

• Both A and C

• To avoid mistakes

• To save time

• To ensure accuracy

What concept helps in adjusting the ratio to the actual number of students?

• Total number

• Scale factor

• Sum of parts

• Proportional statement