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Find out the missing number

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Hi friends...I missed u all... hope you are doing well....

As usual...I`ll start with a very easy puzzle...enjoy it....thanks

If

6+27=195

8+12=236

9+18=270

11+13=321

find... 10+10=?

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Posted (edited) · Report post

Welcome back, Wolfgang!

290.

28*a+b

Edited by k-man
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Posted · Report post

Intriguing. Haven't cracked it yet.

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