Eighth Annual Mathematics Competition
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چکیده
No calculators are allowed on this test. 10 points for a correct answer, 0 points for an incorrect answer, and 2 points for an answer left blank. Problem 1. What is the number of integers between 1 and 1000 that are not divisible by 2 or 5? A) 100 B) 200 C) 250 D) 300 E *) 400 Solution. 1000 minus 500 (those divisible by 2) minus 200 (those di-visible by 5) plus 100 (the ones divisible by 10 we subtracted twice); equals 400. Problem 2. Two trains 6 miles apart start running towards each other with speeds 7 and 5 miles per hour respectively. A fly flies from the first train to the second, turns around, flies back, turns around, flies to
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تاریخ انتشار 2004