if u assume x and y and solving u will be annoyed.

Provided 1/4 is the saving, 3/4 is the expenditure

so Expenditure=3, Income = 4

first make A’s Income and Expenditure ratio parts as below

A

7*8 9*7 12*7

8*7 9*7 15*7

Now make first one as 4 parts by multiplying 4 and second make 3 parts by multiplying 3

A’s Income = 7*8*4 = 224

A’s Expenditure = 8*7*3=168 Saving = 56

Now

B’s Income = 9*8*4 = 288

B’s Expenditure = 9*7*3=189 Saving = 99

A’s Income = 12*8*4 = 384

B’s Expenditure = 15*7*3=315 so Saving = 69

Ratio 56:99:69.