Sumali sa IDNStudy.com at makakuha ng mabilis at maaasahang mga sagot. Tuklasin ang malalim na sagot sa iyong mga tanong mula sa aming komunidad ng mga bihasang propesyonal.

the numerator of a fraction is 9 less than its denominator. if 3 is added to its numerator,the new fraction is 1/2 find the original fraction

Sagot :

ANSWER:  3/12 is the original fraction.

Let the denominator be x
the numerator be x - 9  (nine less than the denominator)

If 3 is added to the numerator, the new fraction is 1/2

[tex] \frac{(x-9)+3}{x} = \frac{1}{2} [/tex]

[tex] \frac{x-6}{x} = \frac{1}{2} [/tex]

LCD (Least common denominator is (2)(x)

[tex](2)(x) \frac{(x-6)}{x} = \frac{1}{2} (2)(x)[/tex]

2x - 12 = x
2x - x = 12
x = 12

The original fraction: (Substitute 12 for x)

x-9 
x      

12-9
 
  12
 
3/12    Original fraction.


To check when 3 is added to numerator, the new fraction is 1/2:

 3 + 3  = 1/2
   12

6/12 = 1/2

1/2 = 1/2