240:a=480:80 a×(288-190)=382 X×81+67=553 489+c×5=9614

Question

240:a=480:80
a×(288-190)=382
X×81+67=553
489+c×5=9614

Answer 1

240: 40=480:80
4,29×89=382
6×81+67=553

Answer 2

240:а=480:80
240:а=6
а=240:6
а=40

а*(288-190)=382
а*98=382
а=382:98
а=4

*+81+67=553
*+148=553
*=553-148
*=405