SomeoneSomewhere

Apparently the 45.1 was the combination of the gravitaionel point of one of the components, and half of the space between the two components. 

0.8 = \(0.8 = {8 \over 10} \)

or  \(0.8 = {2 \over 5} \)

It seems like a good site, but I was looking for more of a self-test one ( sorry for not making that clear, I wasn't aware of what to call such a site, when making the post).

I assume that the equation you ment to write was '739/2*5'

739/2= 369.5

369.5*5=1847.5

Second answer was a mistake, I meant to correct . into a , in answer one.

60 kmH = 60,000 m./h

60,000/60 = 1,000 m./min.

1,000/60 = 16.667 m./sec.

60 kmh = 60.000 m.h 

60.000/60 = 1000 m./min.

1000/60 = 16,667 m./sec.

1² x 0.25 - 4 = -3.75  

A): 326 + 107 = 433 dresses/day.

B) (433 + 326)*68 = 51612 dresses.

Maybe next time use the calculator on this site, it is not that difficult.