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grade 10 math

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Chris has $3.85 in dimes and quarters. There are 25 coins in all. How many of each type of coin does he have?
If d represents the number of dimes and q represents the number of quarters, what two equations describe the problem?

  • grade 10 math -

    Let x = # of dimes and Y = # of quarters.

    10x + 25y = 3.85

    x = 2/5y

    Substitute 2/5y for x in first equation and solve for y. Insert that value into the second equation and solve for x. Check by inserting both values into the second equation.

  • grade 10 math -

    the two equation is
    0.10+0.25=3.85
    x-y=25

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