A. Objective The learners should be able to investigate changes that happen in the absence of oxygen. B. Materials ● fire. Activity: TITLE: ABSENCE OF OXYGEN Jar with cover (Jar A) Jar without cover (Jar B) 2 same sized candle (small) Match or lighter Timer Ruler C. Precautionary Measure Remember to handle match or lighter carefully and don't play with it for it can cause D. Procedure 1. Label the jar with cover with Jar A and the jar without cover as Jar B. 2. Light the candles with a match and put the candles in each jar. 3. Record the time when the candles are lighted and the time when the light was put off. 4. Cover the Jar A and observe what will happen. 5. Measure the length of the candles after the flame was put off. 6. Record your findings on the chart below. Jars JAR A JAR B Time of the flame was put off Length of the candle after burning Answer the following questions: 1. Which of the 2 jars was the candle's flame put off first? 2. Which of the two candles has the shortest size? 3. What happen, when you cover the Jar A? 4. When the lighted candle in Jar A was covered, the flame was put off, what is the reason why the candle's flame did not continue to burn? 5. What are the 3 main components in combustion? Doss​

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Answer:

c. The food will last approximately 21.78 days after selling 32 ducks.

d. It will take 180 days for 30 machines to dig the same hole.

e. When the number of students is doubled to 80, the stock will last for 60 days.

Step-by-step explanation:

c. After selling 32 ducks, the remaining food will last for around 21.78 days. This is calculated using a proportion based on the initial amount of food and the number of ducks sold.

d. If it takes 10 machines 60 days to dig a hole, then 30 machines working at the same speed will be able to dig the same hole in 180 days. This is determined by the inverse proportionality between the number of machines and the time taken to complete the task.

e. If there are initially 40 students and the food stock is enough for 30 days, doubling the number of students to 80 will result in the food stock lasting for 60 days. This is based on the proportionality between the number of students and the duration the food stock will last.