    Sentence 1: Forty to 50 years         ago, the ratio was 3 to 7,  Kessler said , and 10 years ago ,  it was 2to1.    Sentence 2: Forty to 50 years  ago , the ratio was about 3-to-1,  Kessler said , and 10 years ago ,  it was about 2-to-1.