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PLEASE HELP!!!

Liz makes a large amount of purple paint by mixing red and blue paint in the ratio of 3:7. red paint costs £20 for a 3 litre tin. Blue paint costs £30 per 3 litres. Liz wants to make 30 Liters of purple paint. Work out how much it will cost her.

1 Answer

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3 liter of red paint and 7 liter of blue paint mixed together makes 10 liters of purple paint.
to make 30 liters of purple paint, because 30 is 3 times 10, you will need 3 times 3 liters of red and 3 times 7 liters of bule, which is 9 and 21 respectively.
9 liters of red paint is 3 tins, so the cost if 60 dollars, and 21 liters of blue paint is also 7 tins, the cost is 7*30=210
the total is 270
User Hana Alaydrus
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