SOLUTION: One week, a shops sold 42 boxes of stationary, some at $5 a box and some at $7 a box. The total value of the stationary sold was $246. How many boxes were sold at each price?

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: One week, a shops sold 42 boxes of stationary, some at $5 a box and some at $7 a box. The total value of the stationary sold was $246. How many boxes were sold at each price?      Log On


   

Question 897911: One week, a shops sold 42 boxes of stationary, some at $5 a box and some at $7 a box. The total value of the stationary sold was $246. How many boxes were sold at each price?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

Let x represent number of $7 boxes   



7x +5(42-x) = 246

  2x = 36

   x = 18 $7 boxes  and 24 $5 boxes  (42-18 = 24)