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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