There are 2.5 grams of niacin contained in the bottle.
First you have to find how many milligrams are in the bottle.
So you multiply 125 by 20 since there are 125 tablets and 20 milligrams in each one.
125*20=2500
So there are 2500 milligrams in the bottle. Then you have to convert it into grams. To do that you divide the mass by 1000.
2500/1000=2.5
So there are 2.5 grams in the bottle.
The percent of decrease from 20 to 16 is 20%
I would also agree with no solutions
The volume of the bed of the truck is 2.5 x 1.5 x 1.0 = 3.75 cubic meters.
total trips = 7 / 3.75 = 1.87, round up to 2.
They will need to make 2 trips.