A box contains 7 red marbles 4 white and 5 blue if only white are added to the box how many must be added to make the probability of drawing a white marblw 1/3. Plsss answer quick it is due in 7 minutes

i really dont know

step-by-step explanation:

the answer is 48m^2!

step-by-step explanation:

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b