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1. |
A box has 100 blue balls, 50 red ballss and 50 black balls. 25% of blue balls and 50% of red balls are taken away. Then, percentage of black balls at present is ? |
A. | 25% |
B. | 33 |
C. | / |
D. | 40% |
E. | 50 |
Answer» C. / | |