Mental math's shortcut—pupil dilation suggests people start solving before all numbers are in

People often solve simple arithmetic problems, such as basic addition, subtraction, multiplication or division, in their ...
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Simple looking math problem leaves people stumped - can you get the answer in 30 seconds?

A seemingly straightforward math problem has sparked debate online after leaving social media users confused over the correct answer. The brain teaser, which appears simple at first glance, has ...