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.

Question: A table is bought for Rs.400/- and sold at Rs.600/- find gain or loss percentage

 Option A: 15%loss

 Option B: 10%gain

 Option C: 30%gain

 Option D: 20%loss

 Option E: 50% gain
Option E

Question: Three number are in the ratio 5:6:7. The sum of its largest and smallest numbers equals the sum of the third number and 48. Find the third number?

 Option A: 87

 Option B: 57

 Option C: 48

 Option D: 26

 Option E: 28
Option C

Question: Rebecca's annual income is $15,000 and Jimmy's annual income is $18,000. By how much must Rebecca's annual income increase so that it constitutes 50% of Rebecca and Jimmy's combined income?

 Option A: 7000

 Option B: 6000

 Option C: 5000

 Option D: 4000

 Option E: 3000

Option E