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19-05-2018
Mathematics

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Find the cost of 300g if 1/2kg costs 30p

Respuesta :

19-05-2018

0.5kg is the same as 500g.

Let x = the unknown cost of 300g. We will use this to set up a proportion and crossmultiply.

[tex] \frac{500g}{30p} = \frac{300g}{x} [/tex]

Now crossmultiply and solve for x.

500x = 300(30)
500x = 9000
x = 18

300 grams cost 18p

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