Hey there!
The answer is 
We will start by forming an equation to solve this.
So we are starting with a number,
, then doubling it and adding
, which gives us 25.
So:

Now we solve this equation:



Have a super awesome day!
Answer:
6x+19
Step-by-step explanation:
distribute the six to get 6x+12+7
combine like terms 6x+19
move 19 to other side 6x=19
divide by 6
x=3.1666666667
Answer:
for the second question u have asked
Step-by-step explanation:
im going to say 3 but im not very good at math hope that helps
There should be a number of students in 2012
just do 1.2*number of students in 2012 to get the answer