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I am trying to answer this puzzle my friend created and sent to me - which of the five potential answers is correct, and why?

$ 10 \times 5 = 60 \\ 6 \times 12 = 72 \\ 8 \times 3 = 44 \\ 5 \times 9 =\,? $

Possible answers:

A) 54
B) 56
C) 58
D) 60
E) 62

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    $\begingroup$ Hi! You need to include a source if you post a puzzle you didn't create. Also note that you can't include a question that is part of an ongoing competition. Thanks and happy puzzling! $\endgroup$ Nov 8, 2019 at 22:52
  • $\begingroup$ My friend created this puzzle ant sent to me. $\endgroup$
    – black
    Nov 8, 2019 at 23:00
  • $\begingroup$ I added the above information into the original post. I hope that helps, and welcome to PSE! $\endgroup$
    – HTM
    Nov 8, 2019 at 23:03

1 Answer 1

4
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B)56

because:

if "a*b=c" then c=4(a+b)

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