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frez [133]
3 years ago
10

What is the cost of 400g at £1.50 per 1/2kg

Mathematics
1 answer:
Artyom0805 [142]3 years ago
6 0
Well 0.5kg is an awkward number, so let's double £1.50 and 0.5kg to get £3 for 1kg, or 1000g. 

So now, we can set up a proportion. (x is the cost) 

\frac{3}{1000}  =  \frac{x}{400}.

Now we multiply 400 on both sides to get 'x' on its own.

\frac{3}{1000} × 400 = 1.2

So now, we know the cost for 400g = £1.20. 
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