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A bag contains 4 red gumballs, 7 green g...

A bag contains 4 red gumballs, 7 green gumballs, 2 white gumballs , and 5 blue gumballs. How many additional white gumballs nust be added to the 18 gumballls is the bag so thaat the probability of drawing a gumball that is not white is `2/3` ?

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