I can wrote.
1. The percentage of poor people living in Lao is highest among three countries in 1990.
2. The percentage of poor people living in Lao is the highest in 1990.
is the first sentence is correct?
Do the two sentences have the same meaning?
I think you want something like this: In 1990, Lao had the highest poverty rate among the three countries. In 1990, Lao had the highest percentage of people below the poverty line ... Lao was the poorest of these three countries in 1990.
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I think you want something like this:
In 1990, Lao had the highest poverty rate among the three countries.
In 1990, Lao had the highest percentage of people below the poverty line ...
Lao was the poorest of these three countries in 1990. It had the highest percentage of people living in poverty.