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25%x + 40%y = 1260zł
1/4 x + 2/5 y = 1260
x=4050-y
1/4(4050-y) + 2/5y = 1260
1012,5 - 1/4y + 2/5y = 1260
-5/20 y + 8/20 y = 247,5
3/20 y = 247,5
3y = 4950
y= 1650zł
x=2400
x+y=4050zł
25%x + 40%y = 1260zł
______________________
1/4 x + 2/5 y = 1260
x=4050-y
________________________
1/4(4050-y) + 2/5y = 1260
1012,5 - 1/4y + 2/5y = 1260
-5/20 y + 8/20 y = 247,5
3/20 y = 247,5
3y = 4950
y= 1650zł
______________
x wynosi 2400