x/y=4/5 হলে [5/8+(y-x)/(y+x] এর মান কত?

A 23/72

B 72/53

C 53/72

D 72/23

Solution

Correct Answer: Option C

x/y=4/5 
⇒ x=4y/5 
.: প্রদত্ত রাশি = [5/8+(y-x)/(y-z)] 
                = 5/8+ (y-(4y/5))/(y+(4y/5)) 
                =5/8+[(5y-4y)/5/(5y+4y)/5]
                =5/8+ (y/5)/(9y/5) 
                =5/8+(y/5×5/9y) 
                =5/8+1/9 
                =45+8/72 
                =53/72

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