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

12 × 15 + 27 – ? = 28% of 400

$$ { \sqrt{(0.798)^2+0.404×0.798+(0.202)^2}+1=?} $$

In a garden of 42 trees, 3/7 of them are Neem trees and the rest are Mango trees. Find the number of Mango trees.

If a² + a + 1 = 0 then the value of a⁹ is. 

What will be the total number of pieces if the length of $$ {5}{1\over4}$$  the rib is cut to 3/4 m length?

For what value of m will the system of equations 18x-72y+13=0 and 7x-my-17=0 have no solution?

If $$ {1\over3} ({12x\over5}-{1\over2})+{6\over5}={7\over6}$$ then what is the value of x?