Question

For what value of x will x and 12 have the same mean (average) as 4 and 30?

Answer 1

I love proportions and this one is set up to be solved like one. So in the picture I set them = then cross multiplied to yield the equation 2x+24=68 then I solved for x by subtracting 24 from 68 and then dividing by 2.. this gives me the value of x....which is 22...