A boy has 120 balls of which some are white and the remaining are black. If the percentage of white balls is 45%, find the number of black balls he has.
A boy has 120 balls of which some are white and the remaining are black.
Percentage of white balls is 45%.
Total white balls $$=0.45\times 120 = 54$$
Total black balls $$= 120-54 = 66$$
Option B is correct.
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