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: When n is divided by 19, the remainder is 7. When n is divided by 11, the quotient is equal to Z, and the remainder is equal to 7. Z must be divisible by which of the following numbers?

 Option A: 16

 Option B: 18

 Option C: 20

 Option D: 19

 Option E: 22
Option D

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: A library has an average of 510 visitors on Sundays and 240 on other day. The average number of visitors in a month of 15 days starting with sunday is

 Option A: 280

 Option B: 285

 Option C: 290

 Option D: 295

 Option E: 570

Option E