The answer is -24. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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60
(-60) + 24 = -36
(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=387/606 min. 27 sec.
(7 x 8) + (36/9) = 60
60% of 36 is 21.6