math
posted by HELP HELP HELP MNHS on .
On a number line, the coordinate of A is 18 and that of B is 18. C is a point on AB such that AC:CB = 4:5. What is the coordinate of C?
with solution pls... tnx...

Did you make a sketch showing C somewhere between A and B ?
Mark the position of C with x
then AC =x(18) = x+18
and CB = 18x
then (x+18)/(18x) = 4/5
crossmultiply
5x + 90 = 72  4x
9x = 18
x = 2
so C is at 2
check by counting.