On one side of the balance scale, Henry placed a 6-gram weight. On the other side of the scale, he placed a ballet slipper.

How many milligrams does the slipper weigh?
a. 6000 milligrams
b. 600 milligrams
c. 0.6 milligram
d. 60 milligrams

There is not enough information given to answer this question accurately.