Planteamos con regla de tres simple:
1 at-g de Pb ------------ 207 g de Pb
"X"at-g de Pb ---------- 621 g de Pb
X = 621*1/207
X = 3 at-g
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Planteamos con regla de tres simple:
1 at-g de Pb ------------ 207 g de Pb
"X"at-g de Pb ---------- 621 g de Pb
X = 621*1/207
X = 3 at-g