Simplify: (1350 $\div$ 15 - 5) $\div$ (47.5 - 15 x 2.5)

Choose the correct option to complete the alphabet letter series. AB_B, BC _ C, _AB_, AB _ B

What should come in place of the question mark in the following series?
24, 536, 487, 703, 678, ?

Sum to n terms of an Arithmetic progression is 2n² + n then eighth term is

a,b,c are said to be in Harmonic Progression if their reciprocals $\dfrac{1}{a},\dfrac{1}{b},\dfrac{1}{c}$ are in Arithmetic progression. What would be the value of x for which 3, x, 6 are in Harmonic Progression.

Value of $\sqrt{3.\sqrt{3.\sqrt[]{3.^{\sqrt{3....}}}}}$

Introducing a girl, Raj said, "Her mother is the only daughter of my mother-in-law". How is Raj related to the girl?

A fraction is such that if the numerator is multiplied by 2 and the denominator is reduced by 4 we get $ \dfrac{10}{3} $, but if the numerator is increased by 6 and the denominator is doubled we get $ \dfrac{11}{4} $, what is the fraction?

A boy cut a sector containing an angle of 140° from a circle of radius 15 cm and he folded the sector into a cone. What is the curved surface area of the cone {$ \pi=\dfrac{22}{7} $}

If radii of two cylinders are in the ratio 5 : 3 and their heights are in the ratio 3: 5 then ratio of their volumes is