I got it, A saving= 4x -5y --> = (1/4)*A from that we get 4x-5y=x --> 3x=5y saving ratios as mention are: A: 4x-5y B:5x-6y now we take the 3x=5y A: 4x-3x(5y=3x)B:5x-6(3/5)X so we got x:5x-(18/5)x --> let double both side with 5 to eliminate the fruction (1/5) 5x=25x-18x --> the answer is 5:7

ratio problem - need the way to solve it.

The monthly traveling expenses of John are partly constant and partly vary with the number of miles that he travels in a month. When he travels 150 miles the total traveling expenses are $800 and when he travels 180 miles the total traveling expenses are $900. Find the total monthly expenses in a ce...

Tnx for your reply,

please explain as most as you can, i missed something :

a = (b+c+d)/2 = (t-a)/2, so a = t/3


i dont get it how you get to a=t/3 ,