A school plans the weekly reading activities. They have 18 storys books, which is 4 books more than 2 times that of science books. What is the number of science books?

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asked Nov 17, 2021 113k views

2 votes

A school plans the weekly reading activities. They have 18 storys books, which is 4 books more than 2 times that of science books. What is the number of science books?

Mathematics
middle-school

AntonioJunior asked

by AntonioJunior

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1 Answer

2 votes

Answer:

$Number\ of\ science\ books=7$

Explanation:

$Let\ number\ of\ science\ books=x\\\\Story\ books=18\\\\2* science\ books+4=Story\ books\\\\2x+4=18\\\\Subtract\ 4\ from\ both\ the\ sides\\\\2x+4-4=18-4\\\\2x=14\\\\Divide\ both\ sides\ by\ 2\\\\(2x)/(2)=(14)/(2)\\\\x=7\\\\Number\ of\ science\ books=7$