Ratio, Direct, Inverse Proportion

• K=eF

• e=F/K

• F=Ke

• F=e/K

Calculate the value of K (the constant of proportionality)

• 4

• 40

• 90

• 14

Calculate the value of x if F and e are directly proportional to each other.

• 50

• 25

• 0.625

• 1.6

Calculate the value of y if F and e are directly proportional to each other.

• 50

• 12.5

• 128

• 1.28

A group of 5 friends shares a pizza equally, and each person gets 4 slices. If 10 friends share the same pizza equally, should we use direct or inverse proportion to solve?

• Inverse
• Direct

A group of 5 friends shares a pizza equally, and each person gets 4 slices. If 10 friends share the same pizza equally, how many slices will each person get?

The ratio of boys to girls in a classroom is 7:3. If there are 21 boys in the classroom, how many students are there in total?

If 4 kg of apples cost $12, how much will 7 kg of apples cost?. Direct or Inverse proportion

• Direct

• Inverse

If a car travels at 60 km/h and takes 3 hours to reach its destination, how long will it take if the car travels at 90 km/h?

• Direct

• Inverse

If 5 notebooks cost $10, how much will 8 notebooks cost?

• Direct

• Inverse