Samuel asked his friends to guess his age. He said that if you divide his age by the only even prime number and add for the result is the least common multiple of three and five. How old is Samuel?
He's 22 correct? If you divide his age by 2 (the only even prime number) and add four, you get 15 which is the LCM of 3 and 5
22 appears correct. If you let his age be S, then divide by the only even prime (2) and add four, it's equal to the LCM of of 5 and 3 (15), so:
S/2 + 4 = 15
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