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 gambler bought $3,000 worth of chips at a casino in denominations of $20 and $100. That evening, the gambler lost 13 chips, and then cashed in the remainder. If the number of $20 chips lost was 3 more or 3 less than the number of $100 chips lost, what is the largest amount of money that the gambler could have received back?

 Option A: $2,040

 Option B: $2,120

 Option C: $2,240

 Option D: $1,920

 Option E: $1,400
[EX A]: Option C

[EX Q]: Question: If j and k are integers whose product is 400, which of the following statements must be true?

 Option A: n + k > 0

 Option B: n is not equal to k.

 Option C: Either n or k is a multiple of 10.

 Option D: If n is even, then k is odd.

 Option E: If j is odd, then k is even.
[EX A]: Option E

[EX Q]: Question: From an island, it is possible to reach the mainland by either Ferry P or Ferry Q. Ferry P travels for 2 hours at 8 kilometers per hour, while Ferry Q takes a route that is three times longer. If Ferry P is slower than Ferry Q by 4 kilometers per hour, how many hours longer is the journey of Ferry Q compared with the journey of Ferry P?

 Option A: 1

 Option B: 2

 Option C: 3

 Option D: 4

 Option E: 5
[EX A]:
Option B