GRE

简答题

回答题：
What is the smallest natural number which isa multiple of all the numbers from 1through 10(inclusive)?

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B．
The trick is tofactor all the numbers into primes：2，3，2 × 2，5，2 × 3，7， 2×2×2，3 × 3，2×5．Thesmallest multiple will need to have enough copies of each prime to cover all ofthese：2×2×2×3 × 3×5×7=2．520．

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3 The information on a cereal box states that28 9rams of cereal contains 45% of thedaily recommended amount of iron．How much of this cereal must be eaten in order to obtain 100%of thedaily recommended amount of iron?
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