Easy-looking math sum leaves people scratching their heads - can you remember the special rule?

A brain teaser shared online this week has left people stumped. Can you remember the special rule taught in math class to ...
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“It’s basic math”: 90 Day Fiancé: The Other Way’s Sumit gets into an argument with Jenny about the cafe

Jenny and Sumit talks about the cafe after the former makes a blunder in calculations.