Answer :
92 people voted for him out of 115, then he got 92/115 = 4/5 = 0.80= 80%
For those who didn't cote for him , the equation could be written:
100% - 80% =20% (or 20% of 115 = 23 persons)
For those who didn't cote for him , the equation could be written:
100% - 80% =20% (or 20% of 115 = 23 persons)