A can do $$ {4\over 5}$$ of a work in 20 days and B can do $$ {3\over 4}$$ of the same work in 15 days. They work together for 10 days. C alone completes the remaining work in 1 day.  B and C together can complete of $$ {3\over 4}$$ of the same work in:

A, B and three men can finish a work in 10, 20 and 15 days respectively, then in how many days will all three together finish the work?

If $$ {9^{x}={9\over {3^{x}}}}$$ then find the value of x.

The least number that should be added to 2,397 so that the sum is exactly divisible by 3, 4, 5 and 6 ?

The cost of printing a book increased from Rs. 96 to Rs. 120 from the year 2013 to 2018, such that the total money spent on printing books by a printing press increased in the ratio 5 ∶ 6. If the printing press printed 200 books in the year 2013, how many books did they print in the year 2018?

if $$x-{1\over 5},x≠0,$$ then what is the value of $${x^6+3x^3-1}\over x^6-8x^3-1$$=?

If the ratio of the measurements of the three angles of a triangle is 2: 3: 4, then the measurement of its largest angle is.

3x² = 36 then what is the value of x?