A slot machine takes only 20c and 50c coins and
1 answer:
Let the no of 50c coins be x
Then the no of 10c coins will be (21 -x)
VALUE = 0.50x + 0.10(21-x) = 4.90
0.50x + 2.1 - 0.10x = 4.90
0.40x = 2.80
x = 7
ANSWER 7 (50c) coins AND 14 (10c) coins
CHECK
7 X 0.50 = 3.50
14 X0.10 = 1.40
ADD = $4.90
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