In a coding system, 'RAT' is represented as 18, 1, 20 and 'BAT' is represented as 2, 1, 20. What is the code for 'SAT'?

A. 19, 1, 20

Find the missing number in the series: 5, 10, 20, 40, ?

C. 80

If x is a positive integer such that 3x + 5 = 26, what is the value of x?

A. 7
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Choose a word that is similar to the group: 'diligent, industrious, hardworking'.

B. PRODUCTIVE

If A + B means A is the brother of B, A - B means A is the sister of B, and A × B means A is the father of B, what is the relationship of C if A + B × C?

C. C IS A'S SON