human
Three years ago, Bethany was twice the age of her younger sister. In 5 years, her younger sister will be 16. How old is Bethany now?
assistant
How old is Bethany's sister now? ** First find how old Bethany's sister currently is: 16 years - 5 years = <<16-5=11>>11 years
How old was Bethany's sister 3 years ago? ** Then find how old her sister was 3 years ago: 11 years - 3 years = <<11-3=8>>8 years
How old was Bethany three years ago? ** Then double that age to find how old Bethany was three years ago: 8 years * 2 = <<8*2=16>>16 years
How old is Bethany now? ** Then add 3 years to that number to find how old Bethany is now: 16 years + 3 years = <<16+3=19>>19 years
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