posted by Esther .
The Everton college store paid 1519 for an order of 41 calculators. The store paid 9 for each scientific calculator. The other, all graphic calculators cost the store 55 each. How many of each type of calculators was ordered?. Thank you
Let number of scientific calculators = s
Let number of graphing caclulators = g
s + g = 41
9s + 55 g = 1519
Multiply the first equation by 9
9s + 9g = 369
Now subtract #3 from #2
46g = 1150
g = 25
s = 41 - g = ?