Choose the correct answer to the following math problem.
ocho + tres =
o nueve
o diez
o once
o doce

The answer is doce. because tres + ocho es doce

To find the percentage of a number, first, convert it to a decimal and then multiply. 

To convert a percentage to a decimal, move the decimal point over 2 spaces to the left. That makes 80% = 0.80

Then multiply 0.80 by 30.

0.80 • 30 = 24

Peggy got 24 questions correct.