Find the missing number?

Question

Find the missing number?

A. 17
B. 22
C. 20
D. 18

Answer: C

Solution:

The pattern is:

=> (65 + 25) – (33 + 25) = 32,

=> (32 + 9) – (15 + 6) = 20

So, missing number = (18 + 20) – (13 + 5) = 20

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