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(13+47+31+10+20+50+36+54+122+4)/60==(13+47+31+[10+20+50]+36+54+122+4)/60

=(13+47+31+80+[36+54]+122+4)/60

=([13+47]+31+80+90+122+4)/60

=(60+31+80+90+122+4)/60

=(31+122+4+60+80+90)/60

=(153+4+60+80+90)/60

=(157+60+80+90)/60

=(157+140+90)/60

=(157+230)/60

=387/60

6 min. 27 sec.

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13y ago

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