Question

the denominator of a fraction is 1 less than twice its now numerator if 1 is added to numerator and denominator respectively , the ratio of numerator to denominator is 3 : 5 find the fraction​

Answer 1

Answer:

fraction is 5/9

Step-by-step explanation:

Let the numerator of the fraction be ‘x’ and its denominator be ‘y’. Then, the required fraction is x/y. According to the first condition, the denominator is 1 less than twice its numerator.

∴ y = 2x – 1 ∴ 2x – y = 1

(i) According to the second condition, if 1 is added to the numerator and the denominator, the ratio of numerator to denominator is 3 : 5.

∴ (x + 1)/(y + 1) = 3/5

∴ y + 1 = 5

∴ 5(x + 1) = 3(y + 1)

∴ 5x + 5 = 3y + 3

∴ 5x – 3y = 3 – 5

∴ 5x – 3y = -2 ... (ii)

Multiplying equation (i) by 3,

6x – 3y = 3 …(iii)

Subtracting equation (ii) from (iii)

6x-3y=3

5x-3y=-2

x =5

Substituting x = 5 in equation (i),

∴ 2x – y = 1

∴ 2(5) – y = 1

∴ 10 – y = 1

∴ y= 10 – 1 = 9

∴ The required fraction is 5/9.

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