Odpowiedź:
8 lat temu:
Wojtek 0,4x = 16
tata x = 40
dziś:
W y = 24
tata 2y = 48
0,4x + 8 = y
x + 8 = 2y
x + 8 = 2(0,4x + 8)
x + 8 = 0,8x + 16
0,2x = 8
x= 40
y= 8+16= 24
Za ile lat:
(24+x) + (48+x) = 100
2x= 28
x= 14
Za 14 lat
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Odpowiedź:
8 lat temu:
Wojtek 0,4x = 16
tata x = 40
dziś:
W y = 24
tata 2y = 48
0,4x + 8 = y
x + 8 = 2y
x + 8 = 2(0,4x + 8)
x + 8 = 0,8x + 16
0,2x = 8
x= 40
y= 8+16= 24
Za ile lat:
(24+x) + (48+x) = 100
2x= 28
x= 14
Za 14 lat