Sharing-In-A-Ratio Wjec-Eduqas Foundation

• Adding labels to your ratios will help make your working clearer and help you remember which number represents which quantity, e.g.,

A particular shade of pink paint is made using three parts red paint, to two parts white paint.
Mark needs 60 litres of pink paint in order to decorate a room in his house.

Calculate the volume of red and white paint that Mark needs to purchase in order to have enough paint to decorate the room.

The ratio of red to white is

3 : 2

Adding these together gives the total number of parts

3 + 2 = 5

The total amount of paint is 60 litres

∴ 5 parts = 60 litres

Divide both sides by 5 to find out the number of litres in one part

The ratio was 3:2, so multiply both number of parts by 12

<img alt=”table row space straight R colon straight W space row space 3 colon 2 space row cell table row cell cross times 12 end cell downwards arrow end table end cell space space space cell table row downwards arrow cell cross times 12 end cell end table end cell row space 36 colon 24 space end table” data-mathml='<math ><semantics><mtable ><mtr><mtd><mo>&#160;</mo></mtd><mtd><mi mathvariant=”normal”>R</mi></mtd><mtd><mo>:</mo></mtd><mtd><mi 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