What percentage of the world speaks English?
Approximately 20% speak English, if you include people who speak English as a second language.
It's hard to say, but since Lithuania was occupied by the Soviet Union, citizens had to use Russian. Therefore, almost every citizen of Lithuania who is in his thirties or older speaks Russian. The new generation however, mainly speaks in English (as well as Lithuanian of course). My estimate is 60%-80%
The percentage of Brazilians who speak English varies, by region. And within each region, the percentage varies by whether the population is located in bigger cities, smaller towns, or out in the countryside. For example, people are more likely to know English, and to know the language better, in cities such as Rio de Janeiro and Sao Paulo. For those two cities in particular have more of an international interaction with English speaking populations, and…
In Ireland, 98% of the population speaks English. Both English and Irish are official languages, but although Irish is the first official language, only 1% of the population can speak Irish fluently. Almost everyone speaks English as a primary language, those that don't can still understand English.