Please answer the question below, answers would be appreciated. And brainliest will be given out.

Show me how you find the value of each variable and determine what the value of each variable is you i appreciate it : )

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove