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题库 / Prep2007E2-DS-10
Juan bought some paperback books that cost $8 each and some hardcover books that cost $25 each. If Juan bought more than 10 paperback books, how many hardcover books did he buy?
(1) The total cost of the hardcover books that Juan bought was at least $150.
(2) The total cost of all the books that Juan bought was less than $260.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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根据条件：设纸质的为x本，单价$8; 硬纸的为y本,单价$25.
题目：当纸质more than 10本（意味着x>10又因为x,y 都为整数，则有x>=11）求y的值。
条件一：25y≥150 即 y≥6
条件二：8x+25y
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