Is 12000 people voted in the election how many were from 50 to 64 years

Answer: 4200

Assuming that this question is based on a graph, and that this graph tells us that people 50-64 years make up 35% of all the voters, then it would mean that

35%of 12000 = 35/100 * 12000 = 35 * 120 = 4200

So, assuming that people at age 50-64 make up 35% of the voters, then 4200 of them voted.