# ratio and proportion

The total number of biros ordered is 135, 35 of which are coloured, how do I work out the proportion and also the ratio to its lowest form, it just will not sink in

Answers

The proportion is simply the fraction of coloured pens to the total

26 June 2011

So we know there are 35 coloured pens out of a total of 135. So the proportion is 35 out of 135 or 35/135

26 June 2011

When simplifying this ratio just think about the times table that both numbers are in

26 June 2011

So the ratio would be 35 : 100.

26 June 2011

When working out the ratio you must work out the number of pens that are not coloured. This 135 - 35 = 100

26 June 2011

They are both in the 5 times table. There are 7 5s in 35 and 20 5s in 100 so the ratio is then simplified to 7 : 20

26 June 2011

Thanks I am doing a course and Maths was never my strong point

26 June 2011

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