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Sagot :
The answer is 840. I added 15+15, and divided it by 2,5,7,8, and 15 every time. Don't believe me? Try it for yourself.
the smallest counting number divisible exactly by 2578 & 15 is the
LCM of the two numbers
prime factors of 2578 is 2, 1289,
prime factors of 15 is 3, 5,
since there are no common factors between the two numbers
the LCM is 2578* 15 = 38,670
so
38,670 is the smallest number that is divisible exactly by
2578 & 15
LCM of the two numbers
prime factors of 2578 is 2, 1289,
prime factors of 15 is 3, 5,
since there are no common factors between the two numbers
the LCM is 2578* 15 = 38,670
so
38,670 is the smallest number that is divisible exactly by
2578 & 15
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