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Gemiola [76]
4 years ago
13

Help 10 minutes left!

Mathematics
1 answer:
Annette [7]4 years ago
5 0
The answer is the first one
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s = number of books on Sociology

so the order on August 1st looks like 15s + 10e = 4300
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\bf \begin{array}{lllll}&#10;15s&+&10e&=&4300\\&#10;s&+&3e&=&800&#10;\end{array}\\\\&#10;-------------------------------\\\\&#10;\boxed{s}=800-3e\qquad thus&#10;\\\\\\&#10;15s+10e=4300\implies 15\left( \boxed{800-3e} \right)+10e=4300\qquad then&#10;\\\\\\&#10;12000-45e+10e=4300\implies 12000-4300=45e-10e&#10;\\\\\\&#10;7700=35e\implies \cfrac{7700}{35}=e\implies \boxed{220=e}&#10;\\\\\\&#10;now \qquad s+3e=800\implies s+3(220)=800\implies s=800-660&#10;\\\\\\&#10;\boxed{s=140}
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