The sum of two numbers is 21 .3/4 of one of the numbers added to 2/3 to the other gives a sum of 15 . find the two numbers
this is about the 5th time this has been posted.
3/4 x + 2/3 (21-x) = 15
Now solve for x and finish it off.
x+y = 21 OR y = 21-x
(3/4)x + (2/3)y = 15
times 12
9x + 8y = 180
sub in y = ..
9x + 8(21-x) = 180
take over