Question

if 29% of the group voted to change its bylaws and 31% voted against the change, how many people did not vote? the group has 1,930 members ?

Answer 1

What you want to do is to add up what percent voted regardless if they were for or against. so 29+31 is 60%. That means 40% did not vote so you want to multiply the 40% times the number of members .4*1930 to get 772 members did not vote.