Let the required number be 'p'.
From the given data,
p + 12 = 160 x 1/p
=> p + 12 = 160/p
=> p(p + 12) = 160
=> P^2 + 12p - 160 = 0
=> p^2 + 20p - 8p - 160 = 0
=> P(p + 20) - 8(p + 20) = 0
=> (p + 20)(p - 8) = 0
=> p = -20 or p = 8
As, given the number is a natural number, so it can't be negative.
Hence, the required number p = 8.
