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Evaluate (11 + 12 + 13 + ... + 20)/(1 + 2 + 3 + ... + 9).

 Dec 3, 2019
 #1
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3 and 4/9

Plug it in a calculator

 Dec 3, 2019
 #2
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This is the deniomenator of fraction. You can pair 1to 9 to get 10, do this with every number, 5 will be in the middle with no pair, you get 4 pairs, 4*10=40, 40+5=45. For the numerator, you can do the samething, pair 11 to 20 to get 31 it does pair up perfectly, so you compute 31*10 which is the same as 310. I got 310/45= 62/9. There is also a formula, this website should help, http://mathcentral.uregina.ca/qq/database/qq.02.06/jo1.htmlsmiley . Not sure if I made a mistake or not. Visit the website just in case.

 Dec 3, 2019

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