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Question Number 63790 by rajesh4661kumar@gamil.com last updated on 09/Jul/19

Answered by Hope last updated on 10/Jul/19

$$a+b=6k$$$$b+c=7k$$$$c+a=8k$$$$addthem$$$$2(a+b+c)=21k$$$$a+b+c=\frac{21k}{2}$$$$a=\frac{21k}{2}-7k=\frac{7k}{2}$$$$b=\frac{21k}{2}-8k=\frac{5k}{2}$$$$c=\frac{21k}{2}-6k=\frac{9k}{2}$$$$a:b:c=\frac{7k}{2}:\frac{5k}{2}:\frac{9k}{2}=7:5:9$$

Answered by Hope last updated on 10/Jul/19

$${10}^n-1=4707$$$${10}^n=4708=$$$$n={log}_{10}4708$$

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