450+а=920-40 •-340=180+20 y:6=63:7 8•b=100-68

Question

450+а=920-40 •-340=180+20 y:6=63:7 8•b=100-68

Answer 1

450+а=920-40   a=880-450  a=430   a-340=180+20  a=540

y:6=63:7   y:6=9 y=9*6=54

8•b=100-68  b=32/8=4