If 3x - 5y = 5 and  x/(x+y)=5/7 then what is the value of x - y is

A -3

B 3

C 6

D 9

Solution

Correct Answer: Option B

দেওয়া আছে , 3x-5y=5..........(i)
এবং x/(x+y)=5/7
বা,7x=5x+5y
বা,2x=5y.
বা,x=5y/2 ........(ii)
অতএব, (i)
   3(5y/2)-5y=5
বা,15y-10y=10
বা,5y=10
বা,y=2
অতএব ,(ii)
     x=5/2×2=5
অতএব ,x-y=5-2=3

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