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b - mniejsza liczba
60% = 0,6
120% = 1,2
0,6a - 60% większej liczby
1,2b - 120% mniejszej liczby
a + b = 35
0,6a - 1,2b = 3 /*10
a = 35 - b
6a - 12b = 30
a = 35 - b
6(35 - b) - 12b = 30
a = 35 - b
210 - 6b - 12b = 30
a = 35 - b
-18b = -180 /:(-18)
a = 35 - b
b = 10
a = 35 - 10
b = 10
a = 25
b = 10
y- II liczba
x>y
x+y=35
60%x-120%y=3
x+y=35
60/100x-120/100y=3
x+y=35
6/10x-12/10y=3
x=35-y
3/5x-6/5y=3 /*5
x=35-y
3x-6y=15/:3
x=35-y
x-2y=5
x=35-y
35-y-2y=5
x=35-y
-3y=-30
x=25
y=10