This is quite a unique question but I think the time taken is 36
The inverse function is
H-1(x)=3=x
Answer in fraction form is exactly 2/27
Answer in decimal form is approximately 0.07407
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Explanation:
4 people play both,9 play flat flute only, 12 play piano only.
So 4+9+12 = 13+12 = 25 people play one instrument only or they play both.
We have 27 people total meaning that 27-25 = 2 play neither instrument.
Divide the values 2 and 27 to get
2/27 = 0.07407
this value is approximate (rounded to five decimal places)
