Problema Solution
The Everton College store paid $1748 for an order of 48 calculators. the store paid $9 for each scientific calculator. The others, all graphing calculators, cost the store $56 each. How many of each type of calculator was ordered?
Answer provided by our tutors
Let s = # of scientific calculators, g = # of graphing calculators
an order of 48 calculators
1) s + g = 48
s = 48 - g
paid $1748
2) 9s + 56g = 1748
9(48 - g) + 56g = 1748
432 - 9g + 56g = 1748
47g = 1316
g = 28
1) s = 48 - 28 = 20
check
9(20) + 56(28) = 1748
180 + 1568 = 1748
1748 = 1748