SOLUTION: The L.C.M of two numbers 840 and their H.C.F is 10. One number is 70. Find the other number

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Question 838948: The L.C.M of two numbers 840 and their H.C.F is 10. One number is 70. Find the other number
Answer by richard1234(7193) About Me  (Show Source):
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Use the identity gcd(a,b)*lcm(a,b) = ab for positive integers a,b. Here we have 840*10 = 70x --> x = 120, so the other number is 120.