Answer:
30
Step-by-step explanation:
The total number of people is
5+6+4+7+5+3 = 30 people
we are given

Firstly , we will multiply both sides by 5

now, we can simplify it


now, we can solve for n
.............Answer
Melissa will need 1.5 gallons of blue paint for each gallon of yellow paint.
If it was typo and the original equation is 3x^2 - 10x - 8, then the answer would be (<span><span>3x+2)(x-4), but if not then IDK.
Hope this helps!</span></span>