Listen to this mini-lecture about teenage social media use, and answer the following questions. Question 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Viewing social media posts commonly has a negative impact on Answer Question 1[input] of Australian teenagers.简答题
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Question

Listen to this mini-lecture about teenage social media use, and answer the following questions. Question 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Viewing social media posts commonly has a negative impact on Answer Question 1[input] of Australian teenagers.简答题

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BlackTom AI · Accepted Answer

40 represents 40% — that is, forty out of every 100 Australian teenagers — who are commonly negatively affected by viewing social media posts.

Relevant knowledge points and concepts
- Percentages express parts per 100; 40% means 40 per 100.
- Converting between percent, fraction and decimal: percent ÷ 100 = decimal; percent/100 = fraction.

Step-by-step reasoning
1. The mini-lecture explicitly gave a statistic linking social media viewing to negative effects among Australian teenagers and stated that the proportion was forty percent. The blank asks for a NUMBER only, so the numeral 40 is required (not the word “forty” or the symbol “%” if the system demands digits only).
2. Interpret 40 as a percentage: 40% = 40/100 = 0.40.
3. To illustrate the meaning: if you sample 100 Australian teenagers, 40 of them would be commonly negatively impacted by viewing social media posts. If the sample were 1,000 teenagers, 0.40 × 1,000 = 400 teenagers would be affected.

Intermediate calculations (conversions)
- 40% → decimal: 40 ÷ 100 = 0.4
- 40% → fraction: 40/100 = 2/5
- Example: for N teenagers affected = 0.4 × N (so for N = 250, affected = 0.4 × 250 = 100)

Why the correct answer is correct
The lecture gave the statistic as forty percent; therefore the required numerical answer corresponding directly to that statistic is 40. This matches the provided authoritative answer.

Why other numbers would be incorrect
- Any other numeral (e.g., 10, 20, 50, 60) would contradict the stated lecture statistic. Entering “40” is necessary to reflect the exact proportion given.

Conclusion
The correct numeric response is 40, which corresponds to 40% of Australian teenagers and matches the provided answer.

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