A number, on subtracting 15 from it reduces to its 80 %. What is 40 % of the number? 

If $$ {\sqrt{1+{473\over{256}}}=1+{x\over 16}}$$ then what does x equal to ?

A can make a cupboard in 20 days and B can do it in 60 days . Along with C , they did the job in 10 days only . Then in how many days C alone can do the job ? 

If a, b and c are in GP and a^1/x=b^1/y=c^1/z. The value of 2y is?

What should be added to $$ {10 \ over 11} $$ to get the sum $$ {11 \ over 10} $$?

The lengths of one side of a rhombus and one of the two diagonals are 6 cm each. Find the area of the rhombus (in cm²). 

A reduction of 20% in the price of wheat a person enables to purchase 4 kg more for Rs. 160. Find the original price of wheat?

(2x + 4) and (x - 1) are the angle pairs of angles of measurement, then their measurement will be