Question 21
A bag contains a certain number of black and white balls, of which 90% are black. When 9 white balls are added to the bag, the ratio of the black balls to the white balls is $$4 \colon 3$$. The number of white balls in the bag at the beginning is
Correct Answer: 0
Solution
TO BE FILLED - the printed data gives no whole number answer, since taking the white balls as $$w$$ and the black balls as $$9w$$ leads to $$3 \times 9w = 4(w + 9)$$, that is $$23w = 36$$
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