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x+y=52
96x+60y=3900
x=52-y
96(52-y)+60y=3900
x=52-y
4992-96y+60y=3900
x=52-y
-36y=-1092 |*(-36)
x=52-y
y=30 i 1/3
x=21 i 2/3
x+y=52
x=52-y
96/100 × (52 - y) + 60y/100 = 39
4992/100 - 96y/100 + 60y/100 = 39
4992/100 - 36y/100 = 39
4992/100 - 39 = 36y/100
1092/100 = 36y/100
36y = 1092
y = 91/3 = 30,(3)
x = 21,(6)