Question 320379
total number of calculators =45
Let number of scientific calculators be x
other calculators  will be 45-x
..
scientific calculator cost = $11
graphing calculator costs $ 55
..
11x+55(45-x)= 1683
11x+2475-55x=1683
-44x=1683-2475
-44x=-792
x=   18 scientific calculators
45-18= 27 all graphic calculators