Tom sold half of his comic books and then bought 6 more he now has 11 how many did he begin with

Tom began with 10

Step-by-step explanation:

11-6=5; 5 was half of the original number of books. So to get the original amount you double it.

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%