a person in the audience tells the performing mind reader that he has 18 coins worth $3.60 in his pockets, made up of 5cents and 10cents. Within seconds, the mind reader tells him how many of each coin he has. Can you?
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Let number of 5 cents coins = x let the number of 10 cents coins = x total coins, x + y = 18 total money, 0.05x + 0.10y = 3.60 Now, solve these equations to get number of coins of each type.
If 10 cents is the largest coin and he has 18 coins then the most he can have is $1.80 !
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