You can divided each by 4 and get this easy answer..
100 divided by 4= 25. Hope it helps!
The answer is

steps
#1) Try to leave a by itself by dividing any variable next to it

you can only divided these variables as all these variables in the original equation. are being multiplied. The opposite if multiplication is division.
3=x as the answer would be the reciprocal
10,800 milligrams equals 10.8 grams so that the first highlighter has the greater mass