If 10a+10b=35, what is the average (arithmetic mean) of a and b?

1.75

Step-by-step explanation:

If a  and b are two numbers, then their arithmetic mean is

Given:

Divide this equation by 10:

Now, divide it by 2:

step-by-step explanation:

6.48/4 4 goes into 6.48 1.62 times

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!