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The answer on page 49 of the sixth grade mathematics exercise book of the national standard Jiangsu Education Edition.
A =4/5 ethylene propylene = 5/8 b.

170= A+B+C =4/5 B+B +5/8 B。

170/( 1+4/5+5/8)= 170/2.425=70

70*4/5=56

70*5/8=44

So A =56 B =70 C =44.

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