Asap if the original quantity is 15 and the new quantity is 18, what is the percent increase?

First, you would create an equation for this problem. 
=

Next, you would cross multiply. 
15x = 1,800

Now, you would isolate the x. To do this, you would divide both sides by 15. 
x = 120

It is a 120% increase. 

I hope this helps!

1/5 i hope this