Explanation
Step - 1: Taking two general number according to the given conditions.
Let the three number be x,y and z.
We know that the first number is les than the third one by 30% ,so we can write,
x=z−30%(z)=z−30100z=70100z
x=0.7z
Similarly,we know that the second number is 37% less,so we can write
y=z−37%(z)=z−37100z
y=0.63z
Step - 2: Finding relation between x and y.
Difference between x,y = 0.7z−0.63z =0.07x
So, required percentage is difference is what percent of first number
=7x100×107x×100=10100×100=10%
Hence option A is correct.
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