SOLUTION: The Everton College store paid $1920 for an order of 50 calculators. The store paid $9 for each scientific calculator. The others, all graphing calculators, cost the store $58 each

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The Everton College store paid $1920 for an order of 50 calculators. The store paid $9 for each scientific calculator. The others, all graphing calculators, cost the store $58 each      Log On


   

Question 413798: The Everton College store paid $1920 for an order of 50 calculators. The store paid $9 for each scientific calculator. The others, all graphing calculators, cost the store $58 each. How many of each type of calculator was ordered?
The store Ordered__scientific calculators and ___graphing calculators.
Answer by bayners123(12) About Me  (Show Source):
You can put this solution on YOUR website!
This effectively a set of simultaneous linear equations; if s is the number of scientific calculators and g is the number of graphing ones, you have been told that:
1) There are 50 calculators
---> s + g = 50
2) The total cost was $1920
---> s * 9 + g * 58 = 1920
We can solve these in the normal way:
Solved by pluggable solver: Linear System solver (using determinant)
Solve:
+system%28+%0D%0A++++1%5Cs+%2B+1%5Cg+=+50%2C%0D%0A++++9%5Cs+%2B+58%5Cg+=+1920+%29%0D%0A++

Any system of equations:


has solution

or



(s=20, g=30}


So the school ordered 20 scientific calculators and 30 graphical.