It is implied that you have already accounted for some gases and the question is about other gases. But you have provided no information about which gases you know about. Furthermore, there is no information on the context: is it the earth's atmosphere? That of another planet or satellite? Products of some chemical reaction?
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75% nitrogen, 21% oxygen, 3% other gases.
To find 25 percent of 3400, you can multiply 3400 by 0.25. This calculation gives you 850, which is 25 percent of 3400. In other words, 25 percent of 3400 is equal to 850.
8 percent is 0.08 . That's a smaller number than that other monstrosity.
258 To find a percent of a number, move the decimal place of the percent two places to the left and multiply that by the other number. 20% of 215 is 43 215+43=258
730 found etched on any jewelry means that the piece is 73 percent silver. The other percent is most likely copper.