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Solnce55 [7]
3 years ago
14

Page 8 of 16

Mathematics
1 answer:
slava [35]3 years ago
5 0

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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