Please help find the average of x/3 and 2x/5. :(
M Muppers3262 New member Joined Oct 13, 2005 Messages 19 Oct 19, 2005 #1 Please help find the average of x/3 and 2x/5.
T ting Junior Member Joined Sep 18, 2005 Messages 87 Oct 19, 2005 #2 Add them up and divide by 2. x/3 and 2x/5 The lowest common multiply of 3 and 5 is 15 x/3 + 2x/5 = 5x/15 + 6x/15 = 11x/15 Dividing by 2 is to multiply by 1/2, so to halve the fraction, double the denominator. (11x/15)*(1/2) = 11x/30
Add them up and divide by 2. x/3 and 2x/5 The lowest common multiply of 3 and 5 is 15 x/3 + 2x/5 = 5x/15 + 6x/15 = 11x/15 Dividing by 2 is to multiply by 1/2, so to halve the fraction, double the denominator. (11x/15)*(1/2) = 11x/30
