The sum of two numbers is 136. one number is 51. what is the other number? what are the common factors of these two numbers?

 You said that                            51 + (the other number) = 136 .

This is an equation.
I can do anything I want to one side of it,
as long as I do exactly the same thing to
the other side.

Let's subtract  51  from each side:  (the other number) =  136 - 51

                                                                                     =  85 .

The factors of 51 are  1,  3,  17,  and 51 .

The factors of  85  are  1,  5,  17, and 85 .

The common factors are  1  and  17 .

7days is 168 hours in decimal form it is just 168 there is no decimal form for this because it is like 168.0 and there is no number you are dividing it by for it to be a decimal.hope this