In the given question, two equations numbered l and II are given. Solve both the equations and mark the appropriate answer.

I. x²+ 19x + 78 = 0

II. 45y²+ 83y + 28 = 0

What should come in place of the question mark '?' in the following number series?

8.5, 9.5, 21, 66, ?, 1345

The adjoining diagram is frequency polygon for the scores of students in a test.
What is the total number of students appeared in the test?

A number between 1000 and 2000 which when divided by 30, 36 and 80 gives a remainder 11 in each case is:

if x⁴+y⁴+x²y²=21 and x²+y²-xy=7, then what is the value of  $${x\over y}+{y\over x}=?$$

Applied to a bill for ₹ 1,00,000 the difference between a discount of 40% and two successive discounts of 36% and 4% is: 

If the circumference of a circle is equal to the perimeter of a square, and the radius of the given circle is positive, then which of the following options is correct?

If $${45\over53}={1\over{a+{1\over b+{1\over c-{2\over 5}}}}}$$  , where a, b and c are positive integers, then what is the value of (4a-b+3c)?