Question

Solve A=a+b+c+d divided by 4 for c

Answer 1

Given equation is

`A = (a+b+c+d)/(4)`

Now we can multiply both sides by 4


`4A = a+b+c+d`

On subtracting (a+b+d) on both sides.


`4A -(a+b+d) = (a+b+c+d) - (a+b+d)`


`4A - a - b - d = c`

So c is

`c = 4A - a -b-d`