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10x +30 = 180
10x =150
x = 15°
BOD= 2x+5+x = 3x+5
= 3(15)+5
= 45 + 5 = 50°
4x+3x+2x+1x+15+10+5=180
10x+30=180
10x=180-30
10x=150
x=15
BOD = 2x+5+x
=3x+5
=3.15+5
=45+5
=50