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Afla nr necunoscute (100-b:3)×5=490 si (c:9:3)×4=20

Răspuns :

(100-b:3)=490:5
100-b:3=98
b:3=100-98
b=3×2=6
verificare:(100-6:3)x5=98×5=490
b)c:9:3)×4=20
c:3=20:4
c:3=5
c=5×3
c=15
verificare:15:9:3)×4=15:3)×4=5×4=20

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