Odpowiedź:
z.11
k = t - 12
t + 4 = 2*( t - 12 + 4)
t + 4 = 2 t - 16
2 t - t = 20
t = 20
k = 20 - 12 = 8
Kasia ma 8 lat, a Tomek 20.
z.12
g = 4 a
4a + 2 = 6*( a - 2)
4 a + 2 = 6 a - 12
6 a - 4 a = 14
2 a = 14 / : 2
a = 7
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g = 4*7 = 28
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Razem: 7 + 28 = 35
z.12
a < b
a + b = 468
[tex]\frac{a}{b }[/tex] = 0,04 = [tex]\frac{4}{100}[/tex] ⇒ 4 b = 100 a / : 4
b = 25 a
zatem
a + b = a + 25 a = 26 a = 468 / : 26
a = 18
b = 25*18 = 450
Odp. a = 18, b= 450
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