What was the number of families who had incomes less than 35,000 per year 9 years ago

Question

In a local town, 31,500 families have incomes less than $35,000 per year. This number of families is 70% of the families that had this income level 9 years ago. What was the number of families who had incomes less than 35,000 per year 9 years ago?

Answer 1

31,500 have income < 35000

9 years ago 70% or .7(31500) = 22,050 had less than 35000

although the problem is worded ambiguously

maybe it says this year's 31500 is 70% of the 9 year ago number

then x= 31500/.7 = 45,000 9 years ago