You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[EX Q]: Question: If |x + 2| = 10, what is the sum of all the possible values of x?

 Option A: -16

 Option B: -13

 Option C: -4

 Option D: -2

 Option E: 12
[EX A]: Option C

[EX Q]: Question: What is the area of an equilateral triangle whose one side length is 80?

 Option A: 800√3

 Option B: 1000√3

 Option C: 1200√3

 Option D: 1400√3

 Option E: 1600√3
[EX A]: Option E

[EX Q]: Question: A can do a piece of work in 8 days. He works at it for 4 days and then B finishes it in 6 days. In how many days can A and B together finish the work?

 Option A: 4.1 days

 Option B: 4.8 days

 Option C: 3.8 days

 Option D: 2.8 days

 Option E: 4.5 days
[EX A]:
Option B