Ahigh school graduating class is made up of 535 students there are 149 more girls than boys how many boys are in the class

Let's set up a couple of equations:

Let x = number of girls
Let y = number of boys

Graduation class = x + y

There are 535 total students, so:
535 = x + y

Since there are 149 more girls than boys:
x = y + 149

Then let us plug this equation into the equation with the total graduation class:

535 = (y + 149) + y

Then add like terms:

535 = 2y + 149

Subtract 149 to get y on one side:

386 = 2y

Divide by 2 to get the number of boys that are in the class:

y = 193

So now we know that there are 193 boys in the class.

9/12 is the answer because 3/4 times 3 each is 9/12