25x is to 40y as 25y is to what?

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25x is to 40y as 25y is to what?
Which of the following would you expect to be the strongest acid?
TNT explosions are very fast reactions involving the production of enormous quantities of heat and gaseous products. Thermodynamically, explosions are best described as:
Histones are a kind of protein that is known to play a very important role in packaging DNA into chromatin. What of the following characteristics about histones is true?
In how many different orders can six books be organized in a shelf?
Which of the following statements is correct regarding nucleophilic acyl substitution?
Which piece of laboratory glassware is best used to measure 1.000 L of solution accurately?
In the developing embryo, which of the following would be formed from the mesoderm germ layer?
In the normal distribution, what percentage of scores fall within one standard deviation of the mean?
What is the major product obtained from the following reaction?