document.write( "Question 214344: can you help me solve this problem sir....
\n" ); document.write( "1.) In order to encourage his son to study mathematics, a father agrees to pay his boy 50 centavos for every problem correctly solved, and to fine him 25 centavos for each incorrect solution.At the end of 30 problems neither owed anything to the other.How many did the boy solved correctly?\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #161960 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"x\" = the number of problems he solved correctly
\n" ); document.write( "\"30+-+x\" will = the number he solved incorrectly
\n" ); document.write( "given:
\n" ); document.write( "\"50x+=+25%2A%2830+-+x%29\"
\n" ); document.write( "\"50x+=+750+-+25x\"
\n" ); document.write( "\"75x+=+750\"
\n" ); document.write( "\"x+=+10\"
\n" ); document.write( "\"30+-+x+=+20\"
\n" ); document.write( "The boy solved 10 correctly
\n" ); document.write( "check:
\n" ); document.write( "\"50x+=+25%2A%2830+-+x%29\"
\n" ); document.write( "\"50%2A10+=+25%2A%2830+-+10%29\"
\n" ); document.write( "\"500+=+25%2A20\"
\n" ); document.write( "\"500+=+500\"
\n" ); document.write( "OK
\n" ); document.write( "
\n" );