50*(x: 16) =40150 2700+y*400=170700 (12300-300): k=30

50 * (x : 16) = 40150
x : 16 = 803
x = 803 * 16
x = 12848

2700 + y * 400 = 170700
y * 400 = 168000
y = 168000 : 400
y = 420

(12300 - 300) : k = 30
30k = 12000
k = 400