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It is known that A: B = 2: 3 B: C = 5: 2. Please write the proportion of ABC (the proportion of mathematics knowledge in the sixth grade of Soviet education). Thanks, I'll get extra points.
a:B = 2:3 =(2×5):(3×5)= 10: 15

B : C = 5 : 2 = (5×3) : (2×3) = 15 : 6

So A: B: C = 10: 15: 6.

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