Math
posted by Anonymous on .
Find the value of x
40x/3=4
please not the / means a fraction.
I already know that x is 28 when I first saw the question but I'm not sure how to show my working out.

Please I'm really struggling

40  x / 3 = 4 Add x / 3 to both sides
40  x / 3 + x / 3 = 4 + x / 3
40 = 4 + x / 3 Subtract 4 to both sides
40  4 = 4 + x / 3  4
36 = x / 3 Multiply both sides by 3
108 = x
x = 108 
if you put that back into the equation it doesn't work.

If your exspressio mean :
( 40  x ) / 3 = 4
Then multiply both sides by 3
3 * ( 40  x ) / 3 = 3 * 4
40  x = 12 Subtract 12 to both sides
40  x  12 = 12  12
28  x = 0 Add x to both sides
28  x + x = 0 + x
28 = x
x = 28 
thank you!!

You're welcome