Odpowiedź:
105
Szczegółowe wyjaśnienie:
z - Zosia
k- Kasia
j - Jola
z+k = 66 -> k = 66-zz+j = 60k+j = 84
k = 66-zz+j = 6066-z+j = 84
j+z = 60j-z = 18
Dodaj obustronnie
2j = 78j = 39z = 21 k = 45
z+k+j = 21+45+39 =105
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Odpowiedź:
105
Szczegółowe wyjaśnienie:
z - Zosia
k- Kasia
j - Jola
z+k = 66 -> k = 66-z
z+j = 60
k+j = 84
k = 66-z
z+j = 60
66-z+j = 84
j+z = 60
j-z = 18
Dodaj obustronnie
2j = 78
j = 39
z = 21
k = 45
z+k+j = 21+45+39 =105