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Question

In a fraction twice the numerator is 2 more than the denominator . If 3 is added to the numerator and to the denomenator, the new fraction is 23. Find the origional fraction.

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Solution

Let the original fraction be xy
Twice the numerator2x=2 more than the denominator=y+2
y=2x2
Fraction=x2x2
Given:x+3y+3=23
Substitute y=2x2 in x+3y+3=23 we get
x+32x2+3=23
x+32x+1=23
3x+9=4x+2
3x4x=29
x=7
Put x=7 in y=2x2 we get y=2×72=142=12
x=7,y=12
the original fraction is 712


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