# math

I am lost.

Question: Blake bought 21 books. The least he spent for a book was \$18. The most he spent for a book was \$25. What could be the amount that he ended up paying for his books?
a.\$375
b.\$530
c. \$175
d. \$445

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1. Ahhh, great question!!!!

We know two of the prices, the high and the low, which is a total of \$43.
So the average price of the remaining 19 books must be > \$18 and < \$25

(375-43)/19 = 17.5 no good
(530-43)/19 = 25.6 no good
(175-43)/19 = 6.9 no good
(445-43)/19 = 21.1 YUP!, that's it.

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