Răspuns :
6.
Notam c - castraveti; r - rosii,
r = 12
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c = 6 + r
c = 6 + 12
c = 18
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6 + 12 = 18
=> 18 - 12 = 6
=> 18 - 6 = 12
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7.
Notam m - nr. de cutii cu ceai de musetel; t - nr. de cutii cu ceai de tei,
m = 98
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t = m - 25
t = 98 - 25
t = 73
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98 - 25 = 73
=> 73 + 25 = 98
=> 25 + 73 = 98
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Succes!
6). 12+6=18 ( castraveti )
proba : 18-6=12
18-12=6
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7). 98-25=73 (cutii ceai de tei )
proba : 73+25=98
25+73=98
proba : 18-6=12
18-12=6
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7). 98-25=73 (cutii ceai de tei )
proba : 73+25=98
25+73=98