Question

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a*6:9=72
300-(2*a+57)=131
a:8:5=5
(a*4+51)-203=20
a:2+43-(200-56):6=35

Answer 1

a*6:9=72 => a*6=72*9 => a*6= 648 => a=648:6 => a=108

300-(2*a+57)=131 => 300-131=2*a+57 => 169=2*a+57 => 169-57=2*a => 112=2*a => a=112:2 => a=56

a:8:5=5 => a:8=5*5 => a:8=25 => a=25*8=> a=200

(a*4+51)-203=20 => a*4+51=20+203=> a*4+51=223 => a*4= 223-51 => a*4=172 => a=172:4 => a=43

a:2+43-(200-56):6=35 => a:2+43-144:6=35 => a:2+43-24=35 => a:2+19=35 => a:2=16 => a=16*2 => a=32