13. An ancient lady, being asked how old she was, to avoid a direct answer, said: “I have 9 children, and there are 3 years between the birth of each of them; the eldest was born when I was 19 years old, which is now exactly the age of the youngest.” How old was the lady?
14. A gentleman went to sea at 17 years of age; 8 years after that he had a son born, who lived 40 years, and died before his father; after whom the father lived twice twenty years, and then died also. What was the age of the father when he died?
15. A person said he had 20 children, that it happened there was a year and a half between each of their ages; his eldest son was born when he was 24 years old, and the age of the youngest is 21. What was the father’s age?
16. A sheepfold was robbed three nights successively; the first night one-half of the sheep were stolen and half a sheep more; the second night half the remainder were lost, and half a sheep more; the last night they took half that were left and half a sheep more, by which time they were reduced to 20. How many were there at first?
17. There are two numbers, the one 48, the other twice as much. What is the difference between their sum and difference?
18. Two men depart both from one place, the one goes north the other south; the one goes 7 miles and the other 11 miles a day. How far are they distant at the twelfth day of their departure?
19.
When first the marriage knot was tied between my wife and me,
Her age did mine as far exceed, as three times three does three;
But when seven years, and half seven years, we man and wife had been,