If x²+4y²=17 and xy=2, where x>0,y>0, then what is the value of x³+8y³?

A certain number of men can complete a work in 17 days working 8 hour a day. If the number of people is decreased to 60%. Then, find in how many hrs in a day should the remaining people work to complete the work in 51/2 days?

0.15% of $$33{1\over 3}\%$$ of ₹ 10000 is :

A man spends  $${1\over 3}$$ of his income on food,   $${2\over 5}$$  of his income house rent and   $${1\over 5}$$ of his income on clothes. If he still has Rs. 400 left with him, his income is: 

The real number to be added to 13851 to get a number that is divisible by 87 is :

If the length of a rectangle is increased by 10% and the area is unchanged, then how much percent does the breadth decrease?

The diameters of two cones are equal. If their slant heights are in the ratio 5: 2, then the ratio of curved surface areas of the cones is _________ .

Find the greatest number 23a68b, which is divisible by 3 but NOT divisible by 9.