The everton college paid $1914 for an order of 50 calculators. The store paid $11 for each scientific calculators. The others, all graphing calculators, costs the store $55 each. How many of each type of calculator was ordered?

Solution:

scientific calculators: x

graphing calculators: y

The equation is

x + y =50

11x+ 55y = 1914

We solve

x = 19

y = 31

So

scientific calculators: 19

graphing calculators: 31