Ratio Concepts

Rachel, Sara and Teresa have some posters in the ratio 6 : 5 : 2.

Sara has 12 more posters than Teresa.

How many posters do the three girls have altogether?

• 20

• 24

• 40

• 52

Mr Ong gave away 56 bookmarks. The ratio of the bookmarks the boys received to the bookmarks the girls received was 3 : 4. How many bookmarks did the girls receive altogether?

• 32

• 28

• 16

• 12

The ratio of the length of a rectangle to its breadth is 5 : 4. What is the ratio of the length of the rectangle to its perimeter?

• 4 : 9

• 5 : 9

• 5 : 18

• 8 : 11

Two identical squares overlap to form the figure.The area of each square is 4 times the area of the shaded part.Find the ratio of the area of the shaded part to the area of the whole figure.

• 1 : 4

• 1 : 6

• 1 : 7

• 1 : 8

What is the ratio of the number of stars to the number of circles?

• 5 : 7

• 5 : 12

• 7 : 5

• 12 : 5

Aaron packed 5 T-shirts and 3 sweaters for a holiday.

What is the ratio of the number of T-shirts to the total number of T-shirts and sweaters?

• 5 : 3

• 3 : 5

• 8 : 5

• 5 : 8

A piece of wire is 14 cm long.

A piece of string is 9 cm shorter than the piece of wire.

What is the ratio of the length of the piece of string to the length of the piece of wire?

• 14 : 5

• 5 : 14

• 14 : 9

• 19 : 14

The ratio of Adam’s age to Ben’s age is 5 : 9.

Adam is 15 years old.

What is Ben’s age?

The ratio of the breadth to the length of a rectangle is 2 : 3.

The perimeter of the rectangle is 200 cm.

What is the length of the rectangle?

• 20

• 40

• 60

• 80

What is the ratio of pencils to pens?

• 5 : 7

• 7 : 5

• 4 : 5

• 4 : 7