Problems on LCM & HCF Mcqs

Q.  The L.C.M of two numbers is 495 and their H.C.F is 5. If the sum of the numbers is 10, then their difference is__________?

a. 10
b. 46
c. 70
d. 90


ANSWER: See Answer
 
Let the numbers be x and (100 – x).

Then, x(100 – x) = 5 * 495
x2 – 100x + 2475 = 0
(x – 55)(x – 45) = 0
x = 55 or 45
The numbers are 45 and 55.
Required difference = 55 – 45 = 10.
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