In this type of questions, question is provided with substitutes for various mathematical symbols, followed by a question involving calculation of an expression or choosing the correct/incorrect equation. You have to put the real signs in the given equation and then solve the questions as required.

If '&' stands for '+', '~' stands for '÷', '?' stands for '-', '$' stands for '×', then find  the  value  of: 6 $ 15 & 11 $ 5 = ?

According to the Report of the Technical Group on Population Projections (July 2020), India's elderly population is expected to reach ______ million by 2031.

Which art form developed as a result of the fusion of Greek and Indian artistic styles?

Who was the chairman of the Tax Reforms Committee 1991?

In May 2025, scientists have created the first 'pangenome' of which crop, an important staple food in Asia?

A kite flying at a height of 60 metres above the ground is attached to string that makes an angle of 45° with the ground. What is the length (in metres) of the string?

If sin θ + cos θ = $\frac{\sqrt3}{2}$, and θ is an acute angle, find the value of sin² θ + cos² θ − 2sin θ cos θ.

If (x+y):(y+z):(z+x)=7:9:13 for positive reals x,y,z, find x:y:z?

A chord AC subtends an angle of 90° at the center O. If the radius of the circle is 8 cm, what is the length of the chord AC?