200×(х+71)=54000900×(16-с)=5400400×(х-12)=3600​

Question

200×(х+71)=54000900×(16-с)=5400400×(х-12)=3600​

Answer 1

200×(х+71)=54000

х+71=54000÷200

х+71=270

х=270-71

х=199

900×(16-с)=5400

16-с=5400÷900

16-с=6

с=16-6

с=10

400×(х-12)=3600

х-12=3600÷400

х-12=9

х=12+9

х=21