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

$$ 68\sqrt?-826=262 $$

If is a positive acute angle and 5 cosθ + 12 sinθ = 13, then find the value of cosθ?

The number of students in a school increases and decreases by 10% respectively in every alternate year. If there was increase in the year 2000 then in how much percentage what happened in the number of students in the vear 2003 in comparison to year 2000.

The average wages of 500 workers were found to be 200. Later on, it was discovered that the wages of two workers were misread as 180 and 20 instead of 80 and 220. The correct average wages are: 

PQR is a right angled triangle in which PQ = QR . If the hypotenuse of the triangle is 20 cm , then what is the area ( in cm ) of the triangle PQR ?

Anil bought two articles A and B at a total cost of ₹ 10,000. He sold the article A at 15% profit and the actacle B at 10% loss. In the whole deal, be made no profit or no loss. Find the selling price of the article A.

Direction: Percentage of different types of employees in a company in two consecutive years.

From 1997 to 1998 in the case of which of the following types of employees the change was maximum ? 

If the cost price of 15 tables is equal to the selling price of 20 tables. The loss percent is: