Question

The sum the numerator and denominator of a fraction is 12 if the denominator is increased by 3 the fraction becomes 1\2 find the fraction

Answer 1

I got 5/7

Explanation:

Let call our fraction xy, we know that:

x+y=12

and

x/y+3=1/2

from the second:

x=1/2(y+3)

into the first:

1/2(y+3)+y=12

y+3+2y=24

3y=21

y=21/3=7

and so:

x=12−7=5