A positive integer has exactly eight positive divisors. If two of the divisors are 21 and 35, what is the number?


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Ibrahim Chaouki Profile
Ibrahim Chaouki answered

please help me

Tom  Jackson Profile
Tom Jackson answered

Well, just so you understand what you have with what you are given:

You have 2 of the 8 positive divisors and you need 6 more.

You also have the number, which is  21 x 35 = (the number).

Would the factors of 21 and 35 give you any more information?

(The answer is "yes"---and that's plenty of help.)

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