1 answer:
Answer:
(a) 15
(b) 40
Step-by-step explanation:
(a) There are 20 counters, and the probability of selecting a white counter is 0.75.
0.75 = x / 20
x = 15
(b) The probability changes to 0.25. The number of black counters that must be added is:
0.25 = 15 / (20 + x)
20 + x = 60
x = 40
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