Answers

2016-06-25T17:43:15+08:00
Let x be the age of Francis Let 2x be the age of ben x= 10, therefore the age of ben is 20
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2016-06-27T16:15:09+08:00
Francis is 10 yo
Ben is yo

if Francis is 10 yo and
Ben is twice as old of Francis

10×2=20
Ben is 20 yo
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