If Lithium has two isotopes one of 6u and the other 7u and the average – McqOptions

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1.	If Lithium has two isotopes one of 6u and the other 7u and the average mass of lithium atom is 6.925u, then the abundances of the two isotopes of masses 6u and 7u is _______.
A.	15% and 85%
B.	30% and 70%
C.	7.5% and 92.5%
D.	20% and 80%
Answer» D. 20% and 80%

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