The student should describe the mass of your body in the amount of matter in the student's body.
your body fat percentage
lusley
Xstudent = mass of a student
Body Mass Index or BMI
The BMI Index describes your body fat percentage.
Inertia, inertial mass, or mass. All the same.
grams
grams
an extra adjective that's not needed to describe muscle mass. Muscle mass is the amount of muscle in ones body as a % of their total weight.
It describes if you are at a healthy weight for your height and age. If you go to a doctor or personal trainer they can tell you it.
Bone mass should typically make up 20% of your total body weight.
I would describe "900 into mass" as a nonsense phrase.