The denominator of a certain fraction is two more than three times the numerator .If 7 were added to both the numerator and deminator of the fraction ,the new fraction would be equivalent to 3/5 .Which of the following is equivalent to the original fraction ?

A 1/4

B 2/8

C 3/11

D 5/17

Solution

Correct Answer: Option B

মনে করি ,ভগ্নাংশটির লব =x
           এবং  "            হর =y
অতএব , ভগ্নাংশটি =x/y
প্রশ্নমতে ,y-2=3x
          বা, y =3x+2......(i)
এবং (x+7)/(y+7)=3/5
  বা, 5x+35=3y+21
  বা, 5x-3y=-35+21
   বা,5x-3y=-14
  বা, 5x-3(3x+2)=-14
 বা, 5x-9x-6 =-14
  বা,-4x=-14+6
 বা,-4x=-8
 বা,x=2
অতএব,(i)
       y=3.2+2
          =8
অতএব ,ভগ্নাংশটি =2/8

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