SOLUTION: please help me with this usin simultaneous equation.the cost of 20 books is $85.00.some cost $8.00 each and the others cost $3.00 each.how many of each type were bought?
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-> SOLUTION: please help me with this usin simultaneous equation.the cost of 20 books is $85.00.some cost $8.00 each and the others cost $3.00 each.how many of each type were bought?
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Question 190499: please help me with this usin simultaneous equation.the cost of 20 books is $85.00.some cost $8.00 each and the others cost $3.00 each.how many of each type were bought? Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! Let e=number of $8 books & t=number of $3 books.
e+t=20
8e+3t=85
.
e=20-t
8(20-t)+3t=85 substitute 20-t for e.
160-8t+3t=85
-5t=-75t
t=15
e=5
.
Ed
