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Aneli [31]
3 years ago
9

the numerator of a fraction is 2 less than its denominator. when both numerator and denominator are increased by 3, the fraction

is increased by 3/20. find the original fraction
Mathematics
2 answers:
Dmitriy789 [7]3 years ago
7 0
First denominator -- x 
<span>first numerator ---- x-2 </span>

<span>new denominator -- x+3 </span>
<span>new numerator ---- x+1 </span>

<span>(x-2)/x + 3/20 = (x+1)/(x+3) </span>
<span>times 20x(x+3) , the LCD </span>
<span>20(x+3)(x+1) + 3x(x+3) = 20x(x+1) </span>
<span>expanding and simplifying gave me </span>
<span>x^2 + 3x - 40 = 0 </span>
<span>(x-5)(x+8) = 0 </span>
<span>x = 5 or x=-8 </span>

<span>if x=5, the original fraction was 3/5 </span>
<span>if x=-8 the original fraction was -10/-8 or 5/4 </span>

<span>check for 3/5 , new fraction would be 6/8 or 3/4 </span>
<span>3/5 + 3/20 = 12/20 + 3/20 = 15/20 = 3/4 </span>

<span>but for 5/4, new fraction would be 8/7 </span>
<span>5/4 + 3/20 = 28/20 = 7/5 ≠ 8/7 </span>
<span>BUT, if we take the unsimplified fraction -10/-8 , new fraction would be -7/-5 = 7/5 </span>

<span>So the original fraction would be 3/5 for sure, but </span>
<span>also the unsimplified fraction -10/-8</span>
creativ13 [48]3 years ago
4 0
The original fraction will be 3/5 and I am positive. :D
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