In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Q: Question: When a device become less efficient, its production of usable energy will go 
 Answer: down

A: The more efficient a device is, the greater the percentage of usable energy it produces.
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Q: Question: Planets moving closer together will have _____ magnetic attraction. 
 Answer: more

A: As the distance between the objects increases the magnetic force of attraction decreases.
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Q: Question: Eric measures 20 hydrogen ions per 100ml in one solution. Another solution has 30 hydrogen ions per 100ml. The solution with less hydrogen ions is _____ acidic. 
 Answer: less

A:
With a higher concentration of hydrogen ions, a solution is more acidic but has a lower pH.
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