The top of two poles of height 24 m and 42 m are connected by a wire. If the wire makes an angle of 60° with the horizontal, then the length of the wire is

If the students of a class can be grouped exactly into 6 or 8 or 10, then the minimum number of students in the class must be. 

A person lent certain sum of money at 5% per annum simple interest and in 15 years the interest amounted to Rs 250 less than the sum lent. What was the sum lent (in Rs)?

The value of $$ {2(1-sin^{2}θ)}+{2(1-cos^{2}θ)}$$. 

A room in a house measures 5 m in height and its length is 3 times its breadth. The cost of whitewashing its four walls at Rs. 2.50 per sq m is Rs. 200. What is the cost of carpeting the floor at Rs. 5 per sq m? 

Direction: what should come in place at question mark(?).

$$ {4\over 7}×{2{4\over 5}÷{2\over 5}=?}$$

The sum of two numbers is 45 and their ratio is 7: 8. The two numbers are:

The average age of five girls is 11. The oldest among them is 15 years old. What is the average age of the others?