Answer:
1) 50.4
2) 38.4
3) 115.2
Explanation:
1) x+12
2) x
3)3x
X+12+x+3x = 204
5x=204-12
5x=192
x = 192/5
x = 38.4
1) 38.4 +12=50.4
3) 3*38.4 = 115.2
50.4+38.4+115.2 = 204
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