smc-685-35-3+ part ratios

Number, NAP-K4-NC08 SA

The colour cerise is made by mixing red, green and blue paint in the ratio `13 : 3 : 4`.

What is the volume, in litres, of green paint required if 6 litres of cerise paint is made?

Write your answer as a decimal.

litres

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`0.9\ text(litres)`

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`text(Ratio)\ 13:3:4`

`=>\ text(Fraction of green paint needed)`

`= 3/{(13 + 3 + 4)}`

`= 3/20`

`:.\ text(Volume of green paint)`

`= 3/20 xx 6`

`= 0.9\ text(litres)`

Michelle makes 7.0 litres of a healthy shake to sell at her cafe.

The table below shows the mixture of ingredients that go into the shake.

How many litres of milk does Michelle need?

litres

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`2.0\ text(litres)`

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`text(Litres of milk)`	`= text(parts milk)/text(total parts) xx 7.0`
	`= 4/14 xx 7.0`
	`= 2.0\ text(litres)`