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: A is twice as fast as B. If B alone can do a piece of work in 18 days, in what time can A and B together complete the work?

 Option A: 10

 Option B: 16

 Option C: 18

 Option D: 6

 Option E: 12
[EX A]: Option D

[EX Q]: Question: John has only pennies, dimes, and nickels in a jar. The jar has at least 1 but no more than 4 pennies. If the jar has at least 1 nickel and 1 dime, which of the following could NOT be the total amount of money in the jar?

 Option A: 54

 Option B: 55

 Option C: 56

 Option D: 57

 Option E: 58
[EX A]: Option B

[EX Q]: Question: John makes $50 a week from his job. He earns a raise and now makes $80 a week. What is the % increase?

 Option A: 16%

 Option B: 16.66%

 Option C: 17.9%

 Option D: 18.12%

 Option E: 60%
[EX A]:
Option E