Easy-looking math sum divides people - are you a genius who can remember the rule to solve it?

A social media user posted the elementary grade math sum, telling others to solve it without using a pen or paper - can you ...
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Rifle Zero Distances Explained: Is 50, 100, or 200 Yards the Sweet Spot?

Because you’re catching the bullet on the upswing, a 50-yard zero often means you’re close to dead-on again around 160–170 ...