Question

Find the missing number in the following number series:

21      11      12      19.5      41       ?       318

A 100 Correct Answer Incorrect Answer
B 105 Correct Answer Incorrect Answer
C 115 Correct Answer Incorrect Answer
D 125 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

21 x 0.5 + 0.5 = 11  11 x 1 + 1 = 12  12 x 1.5 + 1.5 = 19.5 19.5 x 2 + 2 = 41 41 x 2.5 + 2.5 = 105   105 x 3 + 3 = 318

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