Find the fraction which becomes 1/2 when the denominator is increased by 4 and is equal to 1/8 when the numerator is diminished by 5.
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6/8
Step-by-step explanation:
Let the fraction be x/y.
Then according to the given conditions, we have
x/ (y + 4) = ½
2x = y + 4
2x – y = 4 … (i)
And,
(x – 5)/ y = 1/8
8 (x – 5) = y
8x – 40 = y
8x – y = 40 … (ii)
Now, subtracting (i) from (ii) we get
8x – y = 40
2x – y = 4
(-)–(+)—(-)—
6x = 36
x = 36/6
x = 6
On substituting the value of x in (i), we get
2(6) – y = 4
12 – y = 4
y = 12 – 4 = 8
Therefore, the fraction is 6/8.
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