What will come in the place of question mark (?) in the following question?

  $$?=5\sqrt{ \left(243 \right)^2}$$

A shopkeeper earns a profit of 25 percent on selling a radio at 15 percent discount on the Printed price. Finds the ratio of the Printed price and the cost price of the radio.

Find the conjugate of (1 + i) ³ 

If p = cosec θ – cot θ and q = (cosec θ + cot θ)^-1 then which one of the following is correct?

What is the value of the expression?

(tan0° tan1° tan2° tan3° tan4° …… tan89°)

What is the degree of the differential equation $$y=x\left({dy\over dx} \right)^2+ \left({dx\over dy} \right)^2 ? $$

Find the value of sin (1920°)

Find the greatest value of (a + b) such than an 8-digit number 4523a60 b is divisible by 15.