Posted by firdous on .
Wilma went to the local market and bought 3 lemons and 5 oranges for $2.40.The same day and for the same price ,Fran bought 4 lemons and 7 oranges for $3.31.What was the prices per lemon and the price per orange?

Maths algebra 
PsyDAG,
3L + 5O = 2.40
4L + 7O = 3.31
Multiply fist equation by 4 and second by 3, then subtract one from the other. Insert the orange price into one of the equations to find the lemon price.