Probabilities: "A bag contains counters that are red, blue, green and yellow. There are 9 red, (3x) blue, (x-5) green and (2x) yellow. If the probability of picking a red at random is 9/100, work out the probability of picking a green."
If there is a total of 100 counters, 9 + (3x) + (x-5) + (2x) = 100.
3x + x + 2x = 100 + 5 - 9
6x = 96
x = 16
Probability of picking green = (16 - 5)/100 = 11/100
CD
Related Maths GCSE answers
All answers ▸There are 200 students in Year 10 110 are boys. There are 250 students in Year 11 140 are boys. Which year has the greater proportion of boys? (Taken from Nov 2014 AQA Unit 2)
When do I use the Sine rule?
How do I do simultaneous equations?
Work out the percentage increase from 30 to 420.