Posted by **Connie (g/ma)** on Monday, February 18, 2008 at 9:33pm.

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

- math -
**Reiny**, Monday, February 18, 2008 at 9:51pm
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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