Theo đề, ta có:
\(\dfrac{5n+30+18+10}{8+n}=6.8\)
=>5n+58=54,4+6,8n
=>-1,8n=-3.6
=>n=2
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Theo đề, ta có:
\(\dfrac{5n+30+18+10}{8+n}=6.8\)
=>5n+58=54,4+6,8n
=>-1,8n=-3.6
=>n=2