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 ▸How do I solve a quadratic equation?
7x + 6 > 1 + 2x
The sides of a rectangle are x and (x+2), where x>0 the area of the rectangle is 8, what is the value of x?
The perimeter of a right-angled triangle is 72 cm. The lengths of its sides are in the ratio 3 : 4 : 5 Work out the area of the triangle.