Question 453171
Difference in weight after first 4 weeks is 160-100 = 60lb.
Difference in weight after second 4 weeks is 220-160 = 60lb.
:
The rate of increase is 60 pounds in 4 weeks.
:
So its weight is increased per week as
:
(total increase in 4 weeks)/4 weeks = 60/4 = 15 pounds per week
:
So if it continues with the same rate then after 6 additional weeks it should weigh 
:
220+6*15=220+90=310 pounds.