In "real life" probably never. There are thought to be approximately 1080 atoms in the universe which is way short of a centillion = 10303.
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Oh, isn't that just a wonderful number to imagine, my friend! A centillion centillion is a 10 raised to the power of 606. Just think of all the happy little zeroes dancing together, creating such a vast and beautiful number on our canvas of mathematics. Embrace the joy of numbers and let your imagination soar!
The largest named number that is commonly known is a googolplex. A googol is 10^100 (a one with 100 zeros after it) and a googolplex is 10^googol. Under the traditional naming system of million, billion, trillion, the largest named number is Centillion, which is 10^303 (a one with 303 zeros after it). The largest denomination banknote ever printed was for 1 sextillion (10^21). In science, some large numbers used are Avogadro's number (6.022 x 10^23), which defines the number of molecules in a mole; Graham's number (unimaginably large), which is the upper bound of connections between vertices of hypercubes.
Theoretically you could use both - but the mass in Kg would be a smaller number.
The equation is: 1/2x+(x-8)=25 or it could be x/2+(x-8)=25 It means the same thing. You could use either one that you prefer. The number for x is 22! :-)
It's 8. (Next time you can use calc.exe of your windows.)