instruction:
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:
Question: A car dealership has 40 cars on the lot, 30% of which are silver. If the dealership receives a new shipment of 80 cars, 40% of which are not silver, what percentage of total number of cars are silver?

 Option A: 35%

 Option B: 37.5%

 Option C: 45%

 Option D: 47.5%

 Option E: 50%
answer:
Option E


question:
Question: If the line L passes through the point (3,n) and (n,3), where n is not equal to 3, which of the following must be true?
1. Line L must passes through the first quadrant
2. Line L does pass the origin
3..The slope of L is negative

 Option A: I only

 Option B: II only

 Option C: III only

 Option D: I and II

 Option E: II and III
answer:
Option C


question:
Question: The present ages of three persons in proportions 4 : 5 : 9. Eight years ago, the sum of their ages was 30. Find their present ages (in years).

 Option A: 19, 20, 28

 Option B: 12, 15, 27

 Option C: 20, 35, 45

 Option D: 33,42,43

 Option E: 13, 23,34
answer:

Option B