In 1950, Richard was 4 times as old as Robert. In 1955, Richard was 3 times as old as Robert. In which year was Richard 1.6 times as old as Robert? Choose the correct answer:
A) 1960
B) 1965
C) 1970
D) 1975
E) 1990
In 1950: Ri = 4 Ro -------------- eq1   In 1955: Ri +5 = 3(Ro+5)---------eq2   Thus in 1950, solving eq1 and eq2   1950 Ro= 10 , Ri =40   1990 Ro= 50 , Ri =80 =1.6 times   Thus Ans:1990
<result>E</result>
In 1950, Richard was 4 times as old as Robert. In 1955, Richard was 3 times as old as Robert. In which year was Richard 1.6 times as old as Robert?