Question

two kilograms of bronze costs £7.20.
What is the cost of 300g of bronze?

Answer 1

Set up your equation so that unit labels cancel out leaving you with the units needed for the solution...

300g(kg/1000g)($7.2/2kg)=$1.08

Answer 2

Answer:

£1.08 is the cost of 300g of bronze

Step-by-step explanation:

Proportion states that two ratio or fractions are equal.

Given the statement:

two kilograms of bronze costs £7.20.

use conversion:

1 kg = 1000 gm

then;

2 kg = 2000 gm

then;

2000 gm of bronze costs £7.20.

We have to find cost of 300g of bronze

Let x be the cost of 300 gm of bronze.

By definition of proportion we have;

$\frac{2000}{7.20} = \frac{300}{x}$

By cross multiply we have;

$2000x = 2160$

Divide both sides by 2000 we have;

⇒x = £1.08

Therefore, £1.08 is the cost of 300g of bronze