TASK DEFINITION: Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
PROBLEM: Problem: if 80 percent of a class answered the first question on a certain test correctly, 55 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly ?
Options: a. 10 %, b. ( 8 ) 20 %, c. 30 %, d. 50 %, e. 55 %

SOLUTION: e

PROBLEM: Problem: how many multiples of 4 are there between 12 and 104, inclusive ?
Options: a. 21, b. 22, c. 23, d. 24, e. 25

SOLUTION: d

PROBLEM: Problem: the area of a triangle will be when a = 1 m, b = 2 m, c = 3 m, a, b, c being lengths of respective sides.
Options: ['a. 0 sq m', 'b. 7 sq m', 'c. 2 sq m', 'd. 3 sq m', 'e. 6 sq m']

SOLUTION:
a