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 box has 100 blue balls, 50 red ballss and 50 black balls. 25% of blu

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. /

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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 ?

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