(m-2)-(s-2) = 30
s = 15
(m-2)-(15-2) = 30
m-2-13 = 30
m = 30+15
m = 45
Odp: Mama ma aktualnie 45 lat.
Sprawdzenie:
2 lata temu:
45-2 = 43
15-2 = 13
(mama) 43-13 (syn) = 30
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Mama ma aktualnie 45 lat.
(m-2)-(s-2) = 30
s = 15
(m-2)-(15-2) = 30
m-2-13 = 30
m = 30+15
m = 45
Odp: Mama ma aktualnie 45 lat.
Sprawdzenie:
2 lata temu:
45-2 = 43
15-2 = 13
(mama) 43-13 (syn) = 30