Maths Challenge National Final Relay Race - Ukmt Team, 2010 Page 29
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UKMT Team Maths Challenge 2010 National Final - Relay Race
B14
A bag contains coloured counters. Each counter has a positive
whole number on it. One third of the counters are yellow and the
rest are blue. The probability that a yellow counter has an even
number on it is three eighths and the probability that a blue
counter has an even number on it is one quarter.
Calculate the probability that a counter, drawn at random, has an
even number on it. Give your answer as a simplified fraction.
Answer
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