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The number of prime numbers in (25)13×(10)7×(27)5 is:

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Important Questions on Number System

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The number of zeroes at the end of the product 16×22×15×50×65×115×18×90 is:
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What is the difference in intrinsic value and local value of 6 in 8,631 ?
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How many such numbers are there between 1 and 100 such that each of which is not only divisible by 4, but also has one digit as 4 in the number?
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A number is greater than 3 but less than 8. Also, the number is greater than 6 but less than 10. What is the number?
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In a division, a student took 63 as divisor instead of 36. His answer was 24. The correct answer is:
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How many numbers are there between 500 and 600 in which 9 occurs only once?
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Replace the * in the number 6 * 106 by a suitable digit so that the number formed is exactly divisible by 11.