Ratio and Proportions

Raine and Abella share an electricity bill in the ratio 5 : 4. The electricity bill is $72. How much dose Raine must pay?

• $ 40

• $ 32

• $ 36

• $ 38

Chakra sees these ingredients for a concrete mix. He says that the ratio of cement to sand is 2 : 1. If the amount of sand is 50 gram. How much is the amount of cement?

• 150 grams

• 100 grams

• 50 grams

• 200 grams

Five apples weigh 320 grams. Work out the weight of ten apples.

• 200 grams

• 640 grams

• 360 grams

• 480 grams

Tags

CCSS.5.MD.B.2

The ratio of the sides of a triangle is 2 : 3 : 5. The shortest side of the triangle is 15 cm. How long is the longest side?

• 27.5 cm

• 37.5 cm

• 47.5 cm

• 57.5 cm

The number of hours Hartono and Rodziah spend on homework in a week in ratio 7 : 4.
Rodziah spends 6 hours less than Hartono.
How many hours does Hartono spend on homework?

The mass of sugar, butter and flour used to bake a cake is in the ratio 6 : 4 : 5.
If James used 780g of sugar, what were the masses of butter and flour he used?

it is given that x and y are directly proportional.
Complete the table and write down an equation of y in terms of x.

Tags

CCSS.7.RP.A.2B

it is given that x and y are inversely proportional. Complete the table and write down an equation of y in terms of x.

John worked 5 hours and get salary $100. His salary is directly proportional to the number of hours he worked. 
Find how long he worked if he earns $650.

Tags

CCSS.6.RP.A.3C

15 workers can build a rooftop in 30 days. The number of days required to build the rooftop are inversely proportional.
a. How many days will it take 5 workers to build the same rooftop?
b. how many workers are needed to build the rooftop in 10 days?

Tags

CCSS.7.EE.B.3