Answer :

5 use a calculator and divide it if it shows a five at all in the answer then the answer is five your welcome

Answer:

let the number of yellow balls be x

then probability of picking yellow ball is x/12

without replacement , probability of picking another yellow ball would be (x-1)/11

probability of picking two yellow balls would be x/12(x-1)/11 =5/33

x2-x=5x132/33=660/33=20

x2-x= 20

x2-x-20=0

(x-5)(x+4)=0

x=5 or x=-4

we disregard x=  -4 hence x=5

Step-by-step explanation:

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