out of 500 people how many would you expect to say that his or her first pet was a cat?

Question

first pet	numbers
bird	32
cat	56
dog	66
rabbit	19
other	27

total : 200

Answer 1

First, notice that if you multiply 200 x 2 you get four hundred, which means you need to multiply 56x 2. Then, notice that to get to five hundred you need only 100 more-which is half of two hundred, meaning you need to divide 56 by two and add that to your 56 x 2.

 

56x 2+56/2

Simple!