What is the ratio of the sound intensity just detected by the man to that just detected by the woman?

Question

A middle-aged man typically has poorer hearing than a middle-aged woman. In one case a woman can just begin to hear a musical tone, while a man can just begin to hear the tone only when its intensity level is increased by 5.5 dB relative to that for the woman.

Answer 1

dB = 20*log-base-10(ratio)
ratio = 10^(dB/20) = 10^(5.5/20) = 1.88365