If two fifths and two fifths are reciprocal, find the value of X

If 2 / X and 2 / 5 are reciprocal, X is 5

Because two fifths × five fifths = 1, so two fifths is reciprocal. Right or wrong

Wrong! The two are reciprocal! We can't say them individually

What is the reciprocal of five out of seven and seven out of nine of the sum of two out of five?

According to the meaning of the title, the formula is: (5 / 7 + 2 / 5) * 7 / 9
=39/35*7/9
=13/15
So its reciprocal is 15 / 13

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