the everton college store paid $1830 for an order of 50 calculators. The store paid $9 for each scientific calculator, the others all graphing calculators cost the store $55 each. How many of each type of calculator was ordered?

Question

anonymous · Answer

30 graphing, 20 scientific

anonymous · Answer

The equation is:
1830 = 55x + (50-x)*9
where x = no. of graphing calculators

anonymous · Answer

9x+55y=1830-(1) , x+y=50-(2), 
=> y=50-x put this in eq (1)
then  9x+55(50-x)=1830
=> 2750-46x=1830
=>46x=920
=>46x=920
=>x=20

so y=30

ans is 20 scientific calculators & 30graphing calcs