Question

Arata ca x+2y=z,stiind ca:
y+z:(x-15)=10
(402-x):9=40 rest 2
(x-3)-(y+6)=26

Answer 1

(402-x):9=40 rest 2
402-X=9×40+2
402-X=362
X=402-362
X=40

(x-3)-(y+6)=26
40-3-Y-6=26
Y=31-26
Y=5

y+z:(x-15)=10
5+Z:(40-15)=10
Z:25=10-5
Z:25=5
Z=25×5
Z=125

x+2y=z
40+2×5=125
40+10=125
50=125 (fals)

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