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2x=0,25x+28
1,75x=28
x=16
32=4+28
32=32
2)
x+0,05x+0,1x=69
1,15x=69
x=60
60+3+6=69
69=69
x * 2 = 25% * x + 28
2x = 0,25x + 28
2 x - 0,25x = 28
1,75x = 28 / : 1,75
x = 16
Spr
16 * 2 = 25% * 16 + 28
32 = 4 + 28
32 = 32
Odp. Ta liczba to 16
Zad 2
x +5%x + 10%x = 69
x + 0,05x + 0,1X = 69
1,15x = 69 /: 1,15
x = 60
Spr
60 + 5% * 60 + 10% * 60 = 69
60 + 0,05 * 60 + 0,1 * 60 = 69
60 + 3 + 6 = 69
69 = 69
Odp. Szukaną liczbą jest 60