Proportion 5684

I think the number. If I reduce it three times, increase the proportion by 5/6 and decrease the sum 0.5 times, I get 2 1/7. What's the number?

Correct answer:

c =  5/7

Step-by-step explanation:

a=271=2+71=72 7+1=714+1=715=2712.1429  (3c+65)/0.5=a (3c+65)/0.5=2.1428571428571  (c/3+5/6)/0.5=2.1428571428571  4c=2.857143  c=42.85714286=0.71428571  c=750.714286=75=0.7143

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