$$ (17)^{2} + 6 × (13)^{2}-212×6$$

24% of 680 + 16 % of 525 – 22% of 450 =?

When the square of a natural number subtracted from its cube, the result is 48. Find the number: 

$$ 11^{2}-4096^{1\over 4}+100^{1\over2}=?$$

158.25 x 4.6 + 21% of 847+?= 950.935045

Simplified form of $$ [(^5\sqrt{x^{-3\over 5}}\ )^{-5\over3}]^{-5}$$

A bag has Rs.420 in the denomination of Rs.1, Rs. 2 and Rs. 5 coins. The number Rs.1, Rs.2 and Rs.5 coins are in the ratio of 8: 1:5. How many coins of Rs.5 are in the bag?

Find the value of $$ {5^{1\over2}-[3^{1\over4}+6-4÷2]}$$