Explanation : Sum of production during
odd years (2009, 2011, 2013)
= 90 + 105 + 75 = 270 tonne.
Sum of production during even years
(2010,2012,2014)
=110 + 130 + 120 = 360 tonne.
Let the sum of production during odd
years is x times that of the even years.
270 = x × 360 => x = 270/360.
x =0.75