All of them are except for number 1
One) One millivolt is one thousandths of a volt.
Two) One megagram is one million grams.
The first thing you do is cross multiply which is 3/4x=48 (3/4 = 0.75). Therfore you divide each side by .75. The left side cancels out. For the right side you divide 48 by .75 and gives you 64. x=64
Answer:
if I have my calculations right it would be £120
You need to multiply the amount by the tax