engineering recuitment Vizag Steel MT Mechanical 2020 Test Series Quantitative Aptitude Percentage

A box has 100 blue balls, 50 red balls, 50 black balls, 25% of blue balls and 50% of red balls are taken away. Percentage of black balls at present is 

1
50%
2
25%
3
\(33\frac{1}{3}\%\)
4
40%
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