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I need to set up a system of equations but whenever I solve the equation I get a totally unreasonable answer. Which is counted as wrong.

A boat on a river travels down stream between two points, 20 miles apart, in 1 hour. The return trip against the current takes 2 1/2 hours.  What is the boat speed and how fast does current flow...

A man flies a small aircraft from Miami to Orlando, a distance of 180 miles. Because he is flying into a head wind the trip takes him 2 hours. On the way back the wind is still blowing at the same...

A \$116,000 trust is to be invested in bonds paying 7%, CDs paying 6%, and mortgages paying 10%. The bond and CD investment together must equal the mortgage investment. To earn a \$9460 annual income...

Yolanda has a gourmet coffee shop with two different types of coffee .type A cost 5.90 per pound and type B cost 7.00 per pound. A customer wishes to purchase a mixture of these using two times more...

A bakery sells 10 ounce bags of nuts for \$3.26 per bag. They sell 8 ounce bags of mints for \$4.10 per bag.  They receive a check for \$88.48 for an order of 22 items. How many items did they sell...