Question

How we get 125 ???????????????

Answer 1

If we multiply it by 125 /125 there will not be any change in the value.
Also,the question becomes easy to solve due to 1000 in denominator

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Answer 2

denominator is in the form of 2 rays to power m ×5 rays to power n
if power is not same then we multiply both numerator and denominator to same the power of denominator

so ,here 2 rays to power 3 and 5 rays to power 0 are given then,to same the power we multiply both numerator and denominator by 5 rays to power 3
or5×5×5=125