Question

Emily buys 3 pencils for 51p
Work out the price of 4 pencils.

Answer 1

68p

Explanation:

Emily buys 3 pencils for 51p

Work out the price of 4 pencils.

51 : 3 * 4 = 68p

Answer 2

68

Explanation:

We can write a ratio to solve

3 pencils 4 pencils

------------- = -------------

51 p x

Using cross products

3x = 51*4

3x = 204

Divide by 3

3x/3 = 204/3

x = 68