Question 1149250
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(1) Because the number is divisible by 7, 7 is one of the prime factors of the number.<br>
(2) Because the GCD of the number and some other number is 15, 3 and 5 are prime factors of the number.<br>
So the number has prime factors of 3, 5, and 7, making the number 3*5*7*k where k is some integer.  But 3*5*7 = 105; since the number is less than 120, it must be 105.<br>