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

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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)   (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:


Any system of equations:


has solution

or



(s=20, g=30}


So the school ordered 20 scientific calculators and 30 graphical.
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