1) $M = R + 60 = 6,25.16 = 100 \Rightarrow R = 40(Canxi)$
2) $M = 2R + 96 = 5,5.32 = 176 \Rightarrow 40$
3) $M = 2R + 96.3 = 5,846.58,5 = 342 \Rightarrow R = 27(Al)$
4) $M = 3R + 95.2 = 601 \Rightarrow R = 137(Bari)$
5) $M = 2R + 96.3 = 400 \Rightarrow R = 56(Fe)$
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