Final Answer:
The text in the image is a study guide or answer key for pages 169–172 of a book, likely related to literature (Sherlock Holmes) and science (Lovelock and Rowland’s work on CFCs). It provides sample answers and key points for questions on those pages.
For page 169:
- No one could have known about the letter sent to Sir Henry at the Northumberland Hotel the preceding evening — there was no possible indication.
- Holmes’s first puzzle that morning was figuring out who sent the letter telling Sir Henry to stay away from the moor.
For page 170:
- The person described had an air of professional interest, puzzled eyes, got off the trail, and saw no connection.
- The underlined sentence came from an article in the previous day’s (or yesterday’s) Times, and the note was made by taking words from it.
For page 171:
- Lovelock’s problem: official sea water samples were too contaminated or useless. He solved it by using an old aluminum teapot to collect his own samples.
For page 172:
- Lovelock’s measurements proved CFCs were showing up everywhere / around the globe.
- Rowland realized CFCs stayed in the air for an extraordinarily long time, and their concentrations added up to nearly all the CFCs produced.
These are not math problems — they’re reading comprehension or recall-based answers. No calculations needed. Just match the key phrases and ideas as shown.
✔ Final verified answer: The content is a set of suggested answers for textbook questions on pages 169–172, covering Sherlock Holmes mystery clues and scientific findings about CFCs by Lovelock and Rowland. All answers are provided directly in the text — no further solving required.
Parent Tip: Review the logic above to help your child master the concept of kumon worksheet answers.
