Question 844989
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Hi,
number of nickels she has is <u>10 less then twice</u> the number of pennies{{{ highlight_green(x)}}}  
the number of Dimes she has is <u>20 less than three times</u> the number of pennies{{{ highlight_green(x)}}}
Question states***Maria has a hundred and fifty coins
 x + (2x-10) + (3x-20) = 150
     6x = 180
      x = 30, the number of pennies. 50 nickels and 70 dimes
CHECKING our answer***
30 + 50 + 70 = 150 coins
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