Ok so first you want to construct an equation in which s is the number of tons of sugar to be transported.
Next you want to set up the equation as this: 4500 + 150.25s = 3696 + 200.5s
After you setup the equation, you want to solve for s. You want the numbers with the same look ( I don't know how to explain that sorry lol). It will look like this 4500 - 3696 = 200.5s - 150.25s.
Calculate the numbers on each side of the equation, it should look like this. 804 = 50.25s
Then you divide it, s = 804/50.25 which it should equal 16 tons of sugar! Hope this helps have a good day. c;