Х:6=160-130. а+620=1000-90. 4•а=200-164. 900-x=280+40

Question

Х:6=160-130. а+620=1000-90. 4•а=200-164. 900-x=280+40

Answer 1

X:6=160-130
x:6=30
x=30·6
x=180
a+620=1000-90
a+620=910
a=910-620
a=270
4·a=200-164
4·a=36
a=36:4
a=9
900-x=280+40
900-x=320
x=900-320
x=580

Answer 2

Х÷6=30
х=30×6
х=180

а+620=910
а=910-620
а=290


4×а=36
а=36÷4
а=9


900-х=320
х=900-320
х=580