How much quantity (in kg) of wheat costing Rs 84 per kg must be mixed with 81 kg of wheat costing Rs 60 per kg so that on selling the mixture at Rs 75.9 per kg, there is a gain of 15%?

If P : Q = 9 : 7, then what is the value of (P – Q) : (P + Q)?

The angle subtended by the chord of length 10 cm is 120° at the centre. Calculate the distance of the chord (in cm) from the centre.

Consider the circle as shown in the figure and choose the correct option for this case.

Determine the value of m for which 4x + x6 + m24 is a perfect square.

How many solutions does a pair of linear equations will have, if the equations are 4x+5y-6=0 and 16x+20y+20=0?

Calculate the value of x, if 1 - (x529) = (1623)

Find the remainder in the expression 557 x 653 x 6729?