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The highest power of 3 that completely divides 40! is _____.

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Important Questions on Number Systems

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53!3n is an integer. Find the highest possible value of n for this to be true.
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The highest power of 7 that completely divides 80! is _____.
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115!7n is an integer. Find the highest possible value of n for this to be true.
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The highest power of 12 that completely divides 122! is _____.
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155!20n is an integer. Find the highest possible value of n for this to be true.
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The minimum value of x so that x21024 is a positive integer is _____.
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Find the sum of all two-digit natural numbers which leave a remainder of 3 when divided by 7.
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How many numbers between 1 and 200 are divisible by exactly two of 3, 9, and 27?