brian said 78+92+85 is equal to 300 because each addend is close to 100, and three 100 is the same as 300. explain why brian's reasoning is not reasonable

Brian said 78+92+85 is equal to 300 because each addend is close to 100, and three 100 is the same as 300. Brian reasoning is not correct.

Solution:

According to Brian, 78+92+85 is equal to 300. Because each added is close to 100.

Here the reasoning which went wrong is that 3 addend are close to 100 then there summation will be 300. Because it needs to considered that all the three addend might be close to 100 but are less the hundred. So summation of the three will never be 300, it will always be less than 300.

Hence we can conclude that brain reasoning is not correct.