If the fractions $$ {9\over11}$$, $$ {7\over9}$$, $$ {5\over6}$$ and $$ {11\over13}$$ are arranged in ascending order, which one will be the fourth?

The product of two consecutive odd numbers is 399. Find the lower of them.

The sum of four numbers is 64. If we add 3 to the first number, 3 is subtracted from the second number, the third is multiplied by 3 and the fourth is divided by 3, then all the results are equal. What is the difference between the largest and the smallest of the original number?

The smallest number, which should be added to 756896 so as to obtain a multiple of 11, is :

The sum of the digits of a 2 digit number is 9. When 27 is added to the number, the digits get interchanged. Find the number.

Direction : What value should come in the place of question mark (?) in the following questions?

$$ \sqrt{1089} + 3=(?)^2 $$

Direction : What value should come in the place of question mark (?) in the following questions?

283 ÷25x4 + 186 = ? 

Direction : What value should come in the place of question mark (?) in the following questions?

$$ \sqrt{8281} =(?) $$