Among five persons A, B, C, D and E, A is shorter than B but taller than E. C is the tallest. D is shorter than B but taller than A. Who among them is shortest?

If a, b, c, d, e and f satisfy 2a = 3b = 6c = 9d = 12e = 18f, then what is the value of (a + b)/(c + d + e + f)?

If x is the largest and y is the lowest among ∜6, √2 and ∛4, then (x³+y²)/(x³−y²) is

A father is five times as old as his son, but after 15 years, he will remain only twice as old as his son. What is the age of the father?

If a^b = c^d, then log a / log c is

If bc + cd = 2bd and a + c = 2b, then which one of the following is correct?