10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
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The total is 400.
1000+40=1040 1040+1000=2040 2040+30=2070 2070+1000=3070 3070+20=3090 3090+1000=4000 4000+10=4100
40 (+20, -10, +30 ,-20)
Because you're simply adding everything together !.. 1000+40 = 1040 1000+30 = 1030 1000+20 = 1020 and 1000+10 = 1010... Add everything together and you get... 4000+40+30+20+10 which is 4100 !