6*12=72 thus you can reduce the fraction to-
1/12
Let f be the fathers age and let s be the sons age
f = 60 s = 30
when f = 45
s = 15 which is only a third if his fathers age
when f = 40
s = 10 which is a quarter of his fathers age
therefore when his father was 4 times his age, the son was 10
???? what is the question
Answer:

Step-by-step explanation:

Subtract 67 from both sides

Hope this is helpful