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doua cisterne contin 890 l de petrol.intr-o cisterna exista de 4 ori mai mult petrol decat in cealalta.cat petrol contine fiecare cisterna

Răspuns :

a+b=890 l
a=4b
4b+b=890
b=890:5
b=178 l in a2a cisterna
a=4x178=712 l in prima cisterna
a + b = 890
a = 4b
4b + b = 890
5b = 890
b = 890 : 5
b = 178 l a doua cisterna
a = 4 * 178
a = 712 l prima