how to solve questions 10 and 13?
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Answer:
- no. of blue balls=2*8=16
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Answer:
10.let no . of blue balls =x
no. of red balls =8.
total no. of balls =x+8
P(getting a red ball)=8/x+8
P(getting a blue ball)=x/x+8
given that
2(8/x+8)=x/x+8
by cross multiplication
16(x+8)=x^2+8x
16x+128=x^2+8x
x^2+8x=16x+128
x^2-8x-128=0
x^2-16x+8x-128=0
x(x-16)+8(x-16)=0
x+8=0 or x=-8
orx-16=0 or x=16
since,no. of balls cant be negative so x=16
hence ,no of blue balls is 16.
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