Question 7402
I can see {{{11^2=121}}} in the number, so it's mental math for me.
If it was an SAT question, I could pick give the answer in seconds, but I can explain my reasoning in minutes as follows:
The number is {{{(-12.1)/-0.11=12.1/0.11=1210/11=121*10/11=(121/11)*10=(11^2/11)*10=11*10=110}}}
The reciprocal of {{{110}}} is {{{highlight(1/110)}}}