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7-23.

Nina has some nickels and pennies in her pocket. Her friend, Maurice, has twice as many nickels as Nina. Together, these coins are worth . How many nickels does Nina have? Show all of your work and label your answers.  

Let represent the number of nickels

Nina's money (nickels are worth cents so multiply by ).
Maurice's money.

Set up an equation. Nina's money Maurice's money cents. So, 

Nina has five nickels.