This Bheja Fry question I came across on internet.
If 21 + 10 = 31
22 + 20 = 64
23 + 30 = 99
then 25 + 50 = ???
Answer
The pattern look like this
21 + 10 = 31
22 + 20 = 64
We can decode it as
22 + 22 + 20 = 64
23 + 30 = 99
We can decode it as
23 + 23 + 23 + 30 = 99
Following the same pattern,
24 + 24 + 24 + 24 + 40 = 136 ( which was not given )
Finally
25 + 25 + 25 + 25 + 25 + 50 = 175 !!!!
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