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05 Apr 2022, 07:15
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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The GCD of two numbers is 20 and the LCM is 840. One of the numbers is 120. What is the other number?
(A) 140
(B) 120
(C) 40
(D) 20
(E) 10
(A) 140
(B) 120
(C) 40
(D) 20
(E) 10
05 Apr 2022, 07:19
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If you multiply the GCD and LCM of two numbers, you always get their product. So if our numbers are 120 and x, we have
120x = GCD*LCM
120x = 20*840
x = 140
120x = GCD*LCM
120x = 20*840
x = 140
05 Apr 2022, 07:33
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Product of two numbers = Product of GCD and LCM of those two numbers
=> 120 x Other Number = 20 x 840
=> S = 20 × 7 = 140
Ans A
Posted from my mobile device
=> 120 x Other Number = 20 x 840
=> S = 20 × 7 = 140
Ans A
Posted from my mobile device
