Unit 14. Ratio and Proportion. Year 9

A coat in London costs £65. The same coat in Dublin costs €105.60. The exchange rate is £1 = €1.65.

In which city is the coat cheaper?

• In Dublin

• In London

• Same cost in both cities

A car uses 7.5 litres of petrol for a 120 mile journey.When the tank is full, the car holds 54 litres of petrol.

How far should the car be able to travel on a full tank of petrol?

Chen shares $165 between three friends.

The ratio Blessy to Carlos to Gabriella he uses is

1 : 4 : 6.

Work out how much Carlos receives.

• $60

• $15

• $30

• $120

• $75

An adult lion is 1.21 metres tall.

A baby lion is 55 centimetres tall.

Write the ratio of the height of the adult lion to the height of the baby lion.

Give your answer in its simplest form.

• 0.242 : 11

• 1 : 55

• 11 : 5

• 12 : 55

• 1 : 5.5

The ratio of boys to girls in a school is 4 : 3.

One day, 18 girls are absent from school.

This represents 5% of all the girls in the school.

Calculate the total number of students in the school.

• 720 students

• 630 students

• 360 students

• 240 students

• 840 students

Carlos has some toy bricks.
Each brick is either red or blue.
The ratio of red bricks to blue bricks is 3 : 4.


Choose the correct fraction of the bricks that are blue.

•  $\frac{1}{3}$  

•  $\frac{3}{4}$  

•  $\frac{4}{3}$  

•  $\frac{4}{7}$  

Thomas has a recipe for making Rice Krispie cakes. The recipe uses 120g of chocolate and 80g of Rice Krispies to make 12 cakes.

How much chocolate should Thomas use to make 30 cakes?

Write the missing number in this ratio.

45 : 60 = …… : 4

A 345ml tin of red paint costs £4.80

A 250ml tin of blue paint costs £3.35

A 125ml tin of green paint costs £2.15

A 0.55l tin of yellow paint costs £5.75

Which tin is better value for money?

• Red paint

• Blue paint

• Green paint

• Yellow paint

Camilla joins a soccer club.

The total cost of joining is made up of membership, kit and travel.

The ratio membership : kit : travel is 3 : 5 : 6. The cost of membership is $78.

Which is the total cost of joining?