SOLUTION: 15 books are being bought. Some cost $8.50 each, the remainder cost $9.50 each. Estimate the least number of books that can be bought at $8.50 each if the total cost must not be mo

Question 101218: 15 books are being bought. Some cost $8.50 each, the remainder cost $9.50 each. Estimate the least number of books that can be bought at $8.50 each if the total cost must not be more than $135.50.
Answer by Nate(3500) (Show Source): You can put this solution on YOUR website!
x = number of cheaper books
y = number of more expensive books
x + y = 15 or y = 15 - x
8.5x + 9.5y =< 135.5
Plug:
8.5x + 9.5(15 - x) =< 135.5
8.5x + 9.5(15 - x) =< 135.5
8.5x + 142.5 - 9.5x =< 135.5
-x =< -7
x >= 7
Atleast 7 books ... least amount being seven
RELATED QUESTIONS
A small town library buys a total of 32 books that cost $458. Some of the books cost $13... (answered by SHUgrad05)

A man bought 15 books for #9800. Some of these books cost #600 each and the rest cost... (answered by josgarithmetic)

: A man bought 15 books for #9800. Some of these books cost #600 each and the rest cost (answered by Alan3354,ikleyn,josgarithmetic)

9 books are to be brought by astudent. Some cost $6 each nd the remainder cost $6.50... (answered by lynnlo)

nine books are to be bought by a student. Some cost $6 each and the remainder cost $6.50... (answered by lynnlo)

please help me solve my word problem {nine books are to be bought by a student. Some cost (answered by josgarithmetic,addingup)

a local library bought 54 books. some cost $32 each and some cost $44 each. the total... (answered by jim_thompson5910)

can you help me please.the cost of 20 books is $85.00.some of the books cost $8.00 each... (answered by jonvaliente)