Assuming 
is differentiable over the interval (1, 5), by the mean value theorem we know that there is some 
such that
We're given that 
for all 
, so
that is, the minimum possible value is 8, and the maximum possible value is 12.
1/6 is larger. Say you have a pizza, if you had 7 pieces of pizza, they would be smaller than 6 slices of pizza.
6.48 / 4 =1.62 is your answer
The numbers get smaller in division and larger in multiplying
