A fraction is such that if numerator is multipleed by 3 and denominator is reduced by 3 we get 18/11, but if the numerator is increased by 8and denominator is doubled, we get 2/5 find the fraction
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fraction is such that if the numerator is multiplied by 3 and the denominator is reduced by 3, we get 18/11, but if the numerator is increased by 8 and the denominator is doubled, we get 2/5. Find the fraction.
Answer
Let the fraction be
y
x
Then, according to the given conditions, we have
y−3
3x
=
11
18
and
2y
x+8
=
5
2
⇒11x−6y−18 and 5x+40=4y
⇒11x−6y+18=0 and 5x−4y+40=0
By cross-multiplication, we have
(−6)×40−(−4)×18
x
=
11×40−5×18
−y
=
11×(−4)−5×(−6)
1
⇒
−240+72
x
=
440−90
−y
=
−44+30
1
⇒
−168
x
=
−350
y
=
−14
1
⇒x=
−14
−168
and y=
−14
−350
⇒x=12 and y=25
Hence, the fraction is
25
12
.
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