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2014-10-31T09:55:28+02:00
(a+b+c+d):4=35⇒a+b+c+d=35*4⇒a+b+c+d=140

(a+b+c+d+35):5=(140+35):5=175:5=35
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2014-10-31T13:32:58+02:00
(a+b+c+d).4=35
a+b+c+d=35x4
a+b+c+d=140
(a+b+c+d+25):5=
(140+25):5
165:5=33
17 4 17