问题


There is a single choice question about elementary mathematics. Answer the question by replying A, B, C or D.
Question: Which pair of ratios CANNOT form a proportion?
A. 4 over 5 and 24 over 30
B. 4 over 5 and 20 over 25
C. 36 over 45 and 4 over 5
D. 4 over 5 and 20 over 30
Answer:

答案

模型 模型答案 正确答案
金声玉亮2.0

D. 4 over 5 and 20 over 30
D
deepseekr1

The pairs of ratios form a proportion if their cross-products are equal. Checking each option:

- **A (4/5 & 24/30)**: \(4 \times 30 = 120\) and \(5 \times 24 = 120\). Equal, so proportional.
- **B (4/5 & 20/25)**: \(4 \times 25 = 100\) and \(5 \times 20 = 100\). Equal, so proportional.
- **C (36/45 & 4/5)**: \(36 \times 5 = 180\) and \(45 \times 4 = 180\). Equal, so proportional.
- **D (4/5 & 20/30)**: \(4 \times 30 = 120\) and \(5 \times 20 = 100\). Not equal, so **not proportional**.

**Answer: D**
D
gpto1 D D
GPT-4o D. 4 over 5 and 20 over 30 D
llama3.1-70B-Instruct

B
D
llama3.1-405B-Instruct

D. 4 over 5 and 20 over 30
D
DeepSeek-Coder-V2 D D
Qwen2-72B-Instruct D. 4 over 5 and 20 over 30 D
baichuan4 D D
doubao D

To determine if ratios form a proportion, we check if the cross-products are equal. For A, 4/5 = 24/30 (cross-products are equal); for B, 4/5 = 20/25 (cross-products are equal); for C, 36/45 simplifies to 4/5 (cross-products are equal); but for D, 4/5 is not equal to 20/30 (cross-products are not equal).
D
minimax To determine which pair of ratios cannot form a proportion, we need to check if the cross products of each pair are equal. If the cross products are equal, the ratios form a proportion.

A. 4/5 and 24/30
Cross products: 4 * 30 = 120 and 5 * 24 = 120
Since 120 = 120, these ratios can form a proportion.

B. 4/5 and 20/25
Cross products: 4 * 25 = 100 and 5 * 20 = 100
Since 100 = 100, these ratios can form a proportion.

C. 36/45 and 4/5
Cross products: 36 * 5 = 180 and 45 * 4 = 180
Since 180 = 180, these ratios can form a proportion.

D. 4/5 and 20/30
Cross products: 4 * 30 = 120 and 5 * 20 = 100
Since 120 ≠ 100, these ratios cannot form a proportion.

Therefore, the correct answer is:

D. 4 over 5 and 20 over 30
D
kimi To determine which pair of ratios cannot form a proportion, we need to check if the ratios are equivalent. Ratios are in proportion if the cross-products are equal.

A. \( \frac{4}{5} \) and \( \frac{24}{30} \)
\( 4 \times 30 = 120 \) and \( 5 \times 24 = 120 \), so they are in proportion.

B. \( \frac{4}{5} \) and \( \frac{20}{25} \)
\( 4 \times 25 = 100 \) and \( 5 \times 20 = 100 \), so they are in proportion.

C. \( \frac{36}{45} \) and \( \frac{4}{5} \)
\( 36 \times 5 = 180 \) and \( 45 \times 4 = 180 \), so they are in proportion.

D. \( \frac{4}{5} \) and \( \frac{20}{30} \)
\( 4 \times 30 = 120 \) and \( 5 \times 20 = 100 \), so they are NOT in proportion.

Answer: D
D
wenxinyiyan D

Explanation:
Two ratios can form a proportion if their cross products are equal. In other words, if a/b = c/d, then ad = bc.
A. 4/5 and 24/30
Cross product: 4 × 30 = 120, 5 × 24 = 120
Since 120 = 120, these ratios form a proportion.

B. 4/5 and 20/25
Cross product: 4 × 25 = 100, 5 × 20 = 100
Since 100 = 100, these ratios form a proportion.

C. 36/45 and 4/5
Cross product: 36 × 5 = 180, 45 × 4 = 180
Since 180 = 180, these ratios form a proportion.

D. 4/5 and 20/30
Cross product: 4 × 30 = 120, 5 × 20 = 100
Since 120 ≠ 100, these ratios do not form a proportion.
D
zhipu To determine which pair of ratios cannot form a proportion, we need to check if the ratios are equivalent. Two ratios are equivalent if their cross-products are equal.

Let's evaluate each option:

A. \( \frac{4}{5} \) and \( \frac{24}{30} \)
Cross-multiplying: \( 4 \times 30 = 120 \) and \( 5 \times 24 = 120 \)
Since \( 120 = 120 \), these ratios are equivalent.

B. \( \frac{4}{5} \) and \( \frac{20}{25} \)
Cross-multiplying: \( 4 \times 25 = 100 \) and \( 5 \times 20 = 100 \)
Since \( 100 = 100 \), these ratios are equivalent.

C. \( \frac{36}{45} \) and \( \frac{4}{5} \)
Cross-multiplying: \( 36 \times 5 = 180 \) and \( 45 \times 4 = 180 \)
Since \( 180 = 180 \), these ratios are equivalent.

D. \( \frac{4}{5} \) and \( \frac{20}{30} \)
Cross-multiplying: \( 4 \times 30 = 120 \) and \( 5 \times 20 = 100 \)
Since \( 120 \neq 100 \), these ratios are not equivalent.

Therefore, the pair of ratios that CANNOT form a proportion is:

D. \( \frac{4}{5} \) and \( \frac{20}{30} \)

Answer: D
D
gpto1 D D
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