If 5 is to 20 as x is to 80, what is x?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Prepare for the Praxis Elementary Education Mathematics Test. Engage with flashcards and multiple choice questions, each with hints and explanations. Enhance your chances for exam success!

Multiple Choice

If 5 is to 20 as x is to 80, what is x?

Explanation:
Direct proportion is at work: the two pairs keep the same ratio. Since 5 corresponds to 20, the ratio is 20/5 = 4. So x must pair with 80 to have the same ratio, meaning 80/x = 4. Solving gives x = 80/4 = 20. Therefore, x is 20. If you test other values, you’ll see they don’t maintain the 1:4 ratio (for example, a pair like 40:80 is 1:2, not 1:4).

Direct proportion is at work: the two pairs keep the same ratio. Since 5 corresponds to 20, the ratio is 20/5 = 4. So x must pair with 80 to have the same ratio, meaning 80/x = 4. Solving gives x = 80/4 = 20. Therefore, x is 20. If you test other values, you’ll see they don’t maintain the 1:4 ratio (for example, a pair like 40:80 is 1:2, not 1:4).

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy