SSC Government Jobs Exams Numerical Ability Time and Work

A,B and C can alone complete a work in 15,25 and 30 ays respectively. A and B started the work and after some days A is replaced by C. now the work is completed in a further of 6 4/11 days. how much of the total work did by B?

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SSC Other Question
The area of aright-angled triangle is 34 cm2 and one of the sides containing the
right angle is 6 cm. The altitude on the hypotenuse is A trader marks an article 4x% above CP. he gives discount of x+5% and gets profit of 2x+5%. if discount of 5x/3% is given, find profit%?