Two numbers are in the ratio 4 : 5 and their LCM is 100. What is their difference?
Let say, two numbers are 4k and 5k.
So, LCM(4k,5k)=20k.
So, 20k=100.
or, k=5.
So, Numbers are 20 and 25.
Their difference is 5.
B is correct choice.
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