Question 703770
Suppose that Maria has 170 coins consisting of pennies, nickels, and dimes. The number of nickels she has is 10 less than twice the number of pennies; the number of dimes she has is 18 less than three times the number of pennies. How many coins of each kind does she have?
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let x=number of pennies
2x-10=number nickels
3x-18=number of dimes
..
x+2x-10+3x-18=170
6x-28=170
6x=198
x=33
..
number of pennies=33
number nickels=2x-10=66-10=56
number of dimes=3x-18=99-18=81