The sum of three prime numbers is 90. If one of them exceeds another by 30, then one of the numbers is:
The correct answer is 59.
Recognizing small prime numbers (like 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, etc.) is helpful for solving problems quickly. The sum of two odd numbers is always even. The sum of an odd number and an even number is always odd. These parity rules (even/odd properties) are often useful shortcuts in number theory problems.
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