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Fraction word problem

Sam and Mary each owned one-half of the stock in a printing company. Sam sold two-thirds of his stock to Mary. What fractional part of the printing business does Mary now own?

Solution Preview

According to general understanding, the correct answer should be 5/6.
It follows from 1/2+1/2*2/3=1/2+1/3=5/6.
Why another answer is 7/10 ...

Solution Summary

This is a word problem regarding fractions.