Statistics for Which River in South America?

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#	Description	Letter	River	% Correct
1	The longest river of the continent	A	Amazon	100%
2	Flows through Venezuela, has a large delta	O	Orinoco	92%
4	Rivers forming #3	P	Parana	83%
3	This river separates Montevideo from Buenos Aires	R	Rio de la Plata	79%
5	Rivers forming #3	U	Uruguay	79%
6	Longest tributary of #1	N	Negro	50%
7	Porto Velho, Brazil's river	M	Madeira	46%
10	Tributary flowing into #1, has a namesake Brazillian state	T	Tocantins	42%
14	Tributary of #1, one of the longest beginning with its letter	X	Xingu	33%
9	Rivers forming #7	M	Mamore	17%
11	Guyana's longest river	E	Essequibo	13%
8	Rivers forming #7	M	Madre de Dios	13%
13	The two rivers forming #1	U	Ucayali	13%
12	The two rivers forming #1	M	Maranon	8%