The answer is 90.
28/2.8 = 10
10 x 9 = 90
A weight lifter can bench press 189 kg. How many milligrams (mg) is this?
Answer: We know that:

We are given, that a weight lifter can bench press 189 kg
Therefore, a weight lifter can bench press:



Therefore,
is equal to the 
Answer: 1/6
Step-by-step explanation:
Common denominator is 6 the 1/2 is. 3/6
the 1/3 is 2/6
Subtract. You get 1/6