If the average (arithmetic mean) of 3a and 4b is less than 50, and a is twice b, which is the largest integer value for a?

9

10

11

19

20

3

step-by-step explanation:

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this