Homework Help: grade 10 math

Posted by Rebecca on Thursday, March 10, 2011 at 9:30pm.

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 - PsyDAG, Friday, March 11, 2011 at 11:11am
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.

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