Question

please solve this question by step by step explanation and please solve this question fast and urgent...​

Answer 1

Let x be the required no.

then,

(2/7)^-2 × x = (5/7)^-1

(7/2)^2× x = (7/5)^1

49/4 × x = 7/5

x=7/5×4/49

x= 4/35 is a required number.