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vazorg [7]
3 years ago
7

I am a fraction whose Numerator and denominator are both prime numbers less than 20. If you were to increase each term by 1‚ I w

ould be equivalent to 1/2. What fraction am I?
Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
6 0

Answer:

\frac{2}{5}.

Step-by-step explanation:

Let the unknown fraction be \frac{x}{y}  ,

where, x and y both are prime numbers less than 20.

Now, it is given that adding 1 to both numerator and denominator will make the fraction \frac{1}{2}.

Thus,

\frac{x+1}{y+1} =  \frac{1}{2}

2(x + 1) = y + 1

2x + 2 = y + 1

2x + 1 = y.

Clearly if x will be any odd number , two times x will be odd and adding 1 to it will result in even number and y should be even number , which is not possible as only even prime is 2.

Thus , x should be the even prime which is 2.

And y will be 5.

Thus the required fraction is \frac{2}{5}.

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