go on the street and find a teenager that is able to do mental calculus... you will be lucky if you find some.
A teenager that is able to do mental calculus? Ha, many of them are even unable to tell the hour on a clock with hands! LoL
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ahah indeed one time i taught to read the clock to a 14 years old guy. I'm not joking
Hahaha, yeah! Indeed! I bet you are not joking.