In a certain code, 'DOG' is coded as '47', 'CAT' is coded as '24'. What is the code for 'BAT'?

A. 12

In the series A, B, C, D, E, F, how many times does the letter 'E' appear?

A. 1

If '?' represents multiplication, '?' represents addition, '?' represents subtraction, and '?' represents division, what is the value of 6 ? 3 ? 2 ? 4 ? 2?

C. 16

What is the H.C.F. of the polynomials 2x^2 + 4x and 4x^2 + 8x?

A. 2X

Identify the pattern: 5, 10, 20, 40, ?

C. 80