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

Thrice the square of a natural number decreased by four times the number is equal to 50 more than the number. The number is :

If 999x + 888y = 1332 and 888 x + 999y = 555.then the value of (x + y) is-

A man has eaten 100 grapes in 5 days. He eats 6 more grapes every day in comparison to the previous day. How many grapes did he eat on the first day?

What is the sum of all three-digit numbers which are divisible by 20?

While solving a problem, by mistake, Anita squared a number and then subtracted 25 from it rather than first subtracting 25 from the number and then squaring it. But she got the right answer. What was the given number? 

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

$${210\over14}×{17\over15}×?=4096  $$

The students of a class donated Rs. 3, 481 towards relief fund. Each student donated an amount qual to the number of students in the class. The number of students in the class is: