The result of the equation - 20 plus 90 plus 60 plus 80, is found as follows;
20 + 90 + 60 + 80
= ( 20 + 90 ) + 60 + 80
= 110 + ( 60 + 80 )
= 110 + 140
= 250
Answer = 250
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The result of the equation - 90 plus 90 plus 60 plus 80, is found as follows; 90 + 90 + 60 + 80 = ( 90 + 90 ) + 60 + 80 = 180 + ( 60 + 80 ) = 180 + 140 = 320 Answer = 320
The result of the equation - 30 plus 90 plus 60 plus 80, is found as follows; 30 + 90 + 60 + 80 = ( 30 + 90 ) + 60 + 80 = 120 + ( 60 + 80 ) = 120 + 140 = 260 Answer = 260
The result of the equation - 10 plus 90 plus 60 plus 80, is found as follows; 10 + 90 + 60 + 80 = ( 10 + 90 ) + 60 + 80 = 100 + ( 60 + 80 ) = 100 + 140 = 240 Answer = 240
It is: 80+90+60 = 230
(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.