Question

what number must be added to both the numerator and the denominator of the fraction 5/21 to give a fraction equal to 3/7?

Answer 1

7

Answer 2

how?

Answer 3

(5+x) / (21+x) = 3/7

Answer 4

let the number be x....then
(5+x)/(21+x)=3/7
crossmultiply
35+7x=63+3x
4x=28
x=7

Answer 5

let the number that you must add be called x.
on the top you have 5+x while on the bottom you have 21+x
together they must form a fraction equal to 3/7

Answer 6

(5+x)/(21+x)=3/7
crossmultiply
35+7x=63+3x
4x=28
x=7

Answer 7

^Quit cheating -_-

Answer 8

http://lmgtfy.com/?q=+what+number+must+be+added+to+both+the+numerator+and+the+denominator+of+the+fraction+5%2F21+to+give+a+fraction+equal+to+3%2F7%3F+

Answer 9

fine then

Answer 10

Just stop. -.-

Answer 11

why

Answer 12

u stop

Answer 13

lol

Answer 14

now all we need is a "let me wolframalpha that for you" site