document.write( "Question 1187631: Suppose the Davao Light and Power Company donated 2500 books to Davao City National High School library; 40% are earth science books, 30% of schools are chemistry books, 20% are math books, 5% are English books, and the other 5% are physics books. How many books are earth science and how many books are physics? \n" ); document.write( "
Algebra.Com's Answer #818633 by ikleyn(52788)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "The number of earth science books is 40% of 2500.\r
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\n" ); document.write( "\n" ); document.write( "The number of Physics books is 5% of 2500.\r
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\n" ); document.write( "\n" ); document.write( "These questions are of the  \" 2 x 2 = 4 \"  level of complexity.\r
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\n" ); document.write( "\n" ); document.write( "It is the level of an advanced alumni of a kindergarten.\r
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\n" ); document.write( "\n" ); document.write( "If you need very introductory knowledge on percentage, look into the link\r
\n" ); document.write( "\n" ); document.write( "    - Percentage problems\r
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