Hi,

number of nickels she has is 10 less then twice the number of pennies  

the number of Dimes she has is 20 less than three times the number of pennies

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

Wish You the Best in your Studies.



 

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