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2014-03-04T14:43:50+02:00
A+b+c+d=950
a=75
b=75×3=225
c=(a+b):10=(75+225):10=300:10=30
d=950-(a+b+c)=950-(75+225=30)=950-330=620
2014-03-04T14:45:15+02:00
A+b+c+d=950
75+(75x3)+[75+(75x3)]/10+c=950 ⇒ 75+225+30+c=950 ⇒ c= 950-225-75-30 ⇒ c=620
a=75
b=225
c=30
d=620