Find the missing term

MK : 169/121 : : JH : ?

The relation between velocity (V), frequency (n) and wavelength (λ) of a wave is given by

A hollow sphere in which a circus motorcyclist performs his stunts, has an inner radius of 7 m. Find the area available to the motorcyclist for riding. (Take Π= 22/7)

From a circular card sheet of radius 14 cm, two circles of radius 3.5 cm and a rectangle of length 3 cm and breadth 1 cm are removed. Two identical right triangles whose legs are of length 3 cm and 4 cm are joined. Then the area of the newly formed card is 

The price of 2 sarees and 4 shirts is Rs. 1600 with the same money, one can buy 1 saree and 6 shirts. If one wants to buy 12 shirts, how much shall he have to pay

If a, b, c, l, m are in A.P. then the value of 2a-b-2c-l+2m is