Level 7 Probability question.
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Ok so this is about finding equivalent fractions.
If we know that 1/6 of the counters are black and 1/3 of the counters are red then we can find what proportion of the counters are green by making 1/6 and 1/3 equivalent. To do this we ask what do we have to do to make 3 equal 6? We can multiply it by two. So 1/3 = 2/6.
So if 2/6 are red and 1/6 are black then we know that 3/6 are green (6-2-1=3)
If 3/6 is equivalent to 15 then we have to ask what do we have to do to make 3 equal 15? We multiply it by 5. We know that 1/6 is the proportion of black counters so we multiply 1x5 = 5. There are 5 black counters.
16 February 2011
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