Posted by **5 grade** on Tuesday, November 29, 2011 at 3:15pm.

this is a math riddle that i can't do so please help i am a fraction eguivalent to 2/4 the sum of my numerator and my denominator is 21 what fraction am i

here it is help me please's

- math -
**Steve**, Tuesday, November 29, 2011 at 3:50pm
Since the sum is odd, either the numerator or denominator is odd.

Since the fraction is 1/2, the denominator is even. So, we want a faction with odd numerator, even denominator, where they add to 21 and denominator is twice the numerator.

1/2? no

3/6? no

5/10? no

7/14 <<<---

or, since the denominator is twice the numerator, that means 3 times the numerator is 21. So, 7/14.

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