If U+V=80 and U:V=5:3 then find out the U-V.

If a + b + c = 0, then a³+b³+c³ is equal to 

 ₹ 800 becomes ₹ 956 in 3 years at a certain rate of simple interest. If the rate of interest is increased by 4 %, what amount will ₹ 800 become in 3 years? 

Find the greatest number which will exactly divide 200 and 320. 

The greatest number that divides 411, 684, 821 and leaves 3, 4 and 5 as remainders, respectively, is 

What approximate value should come in place of the question mark (?) in the following question? 
21.9714 × (8.8749 - 4.9393) = ?

A cloth merchant sold half of his cloth at a 40% profit. half of remaining at 40% loss and the rest was sold at the cost price. In the total transaction, his gain or loss will be