Study the given table and answer the question that follows.
The given table shows the production of different types of refrigerators in a company.
Years Types of Refrigerators
A B C
2011 2018 1800 1932
2012 2040 1890 1800
2013 2035 1910 1890
2014 2020 1940 1978
2015 1997 1960 1900
In which of the given year(s) was the production of B type refrigerator closest to its average production over the given years?
The measures of the three angles of a triangle are in the ratio 17 : 13 : 15. Find the positive difference between the greatest and the smallest of these three angles.
A certain sum of money becomes seven times itself when invested at a certain rate of simple interest, in 14 years. How much time (in years, rounded off to 2 decimal places) will it take to become 18 times itself at the same rate