Page 8 of 16
Megan has a bag containing
white counters and black counters.
There are 20 counters in the bag altogether.
The probability of choosing a
white counter from the bag is 0.75
(a) How many white counters are in the bag?
(b) Megan adds more black counters to the bag.
How many black counters must she add so that the probability of
choosing a white counter is 0.25?
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