Question

A bag contains 15 balls of which x are red. a) Write an expression for the...

A bag contains 15 balls of which x are red.

a) Write an expression for the probability that a ball drawn at random from the bag is red.

b) When five more red balls are added to the bag, the probability of drawing a red ball becomes ¾. Find the value of x.

Math   Statistics-And-Probability   
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