The value of x in the given equation
$$ {23 ^2 + \sqrt{x}=625}$$

If 0.4 m + 0.8 n = 2.2 and 0.8 m + 0.4 n = 1.4, then the value of $$ {m^2}+{n^2}$$ is equal to 

Find the cost in rupees for carpeting a room 65dm× 30 dm at Rs. 45 per sq.m

The investments made by X and Y are the ratio 3: 2. If 5% of total profit is donated and X gets ₹ 8,550 as his share of profit then what is the amount of total profit. 

The ratio of the sides of a triangle is $$ {1\over2}$$: $$ {1\over3}$$: $$ {1\over4}$$ and its perimeter is 104 cm. is. What is the length of the longest arm?

When a number is increased by 28, it becomes 107% of itself. What is the number?

If AD, BE and CF are medians of ∆ABC, then which one of the following statements is correct? 

A man is walking at a speed of 12 km / h. After every kilometer he relaxes for 4 minutes. How much time (in minutes) will it take to cover a distance of 8 kilometers?