A number plus 52.2 times 52 plus itself minus 2.5% of 400 is exactly 2740. What's the number

A number plus 52.2 times 52 plus itself minus 2.5% of 400 is exactly 2740. What's the number

Let this number be x, then we have:
x+52.2×52+x-400×0.025=2740;
x+2714.4+x-10=2740;
2x=35.6;
x=17.8;
This number is 17.8
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If M and N are reciprocal to each other, then what is one by one of M molecules?

1

M and N are reciprocal to each other. What is the sum of M ／ n?
Beautiful sisters, handsome brothers,

mn=1
So the original formula is m / 13 × n / 2
=mn/26
=1 / 26