Homework Help: Math

Posted by AJ on Thursday, May 12, 2011 at 9:36am.

A bag contains forty coins, all of them either 2c or 5c coins. Let there be x 2c coins and y 5c coins. If the value of money in the bag is $1.55, find the number of each kind.

Math - PsyDAG, Thursday, May 12, 2011 at 11:33am
5x = 2y therefore

x = 2/5y

x + y = 155

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

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