SOLUTION: Hello please help me. I just can not deal with word problems. I always mess them up please help me solve this. Everton college $1625 for an order of 47 calculators. the store pa

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Question 127167: Hello please help me. I just can not deal with word problems. I always mess them up please help me solve this.
Everton college $1625 for an order of 47 calculators. the store paid $10 for each scientific calculator, The others all graphing calculators cost the store $57 each. How many of each type were ordered?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let call the graphing calculators, G, and the scientific calculators, S.
The total number of calculators is 47.
1.G%2BS=47
The total cost to the college was $1625(G cost $57, S costs $10).
2.57%2AG%2B10%2AS=1625
Now use equation 1 and come up with an expression for G in terms of S.
G%2BS=47
G=47-S
Substitute that expression into equation 2.
2.57%2AG%2B10%2AS=1625
57%2A%2847-S%29%2B10%2AS=1625
2679-57%2AS%2B10%2AS=1625
2679-47%2AS=1625
-47%2AS=-1054
S=%28-1054%29%2F%28-47%29
S=22.43
Oops, it's not an integer value.
Can't buy 0.43 of a calculator.
Please re-check your numbers and re-post the question.
The procedure is still valid.
It does work for $1645. (G=25,S=22).