document.write( "Question 855461: Hi! Please help me to solve this:\r
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Algebra.Com's Answer #515364 by ramkikk66(644)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Enough salt was added to 30kilos of a 10% salt solution to increase the salt concentration to 25%. How many kilos of salt were added?\r\n" );
document.write( "Ans:\r\n" );
document.write( "Originally the solution is 30 Kg an has 10% salt. i.e. the weight of salt\r\n" );
document.write( "in the solution = 30*10% = 3 Kg.\r\n" );
document.write( "Let us say we added x kg of salt.\r\n" );
document.write( "Now in the new solution, weight of salt = 3 + x\r\n" );
document.write( "Weight of the new solution = 30 + x\r\n" );
document.write( "If this is a 25% solution, it means that\r\n" );
document.write( "\"%28x+%2B+3%29%2F%28x+%2B+30%29+=+0.25+=+1%2F4\"\r\n" );
document.write( "or\r\n" );
document.write( "\"4%2A%28x+%2B+3%29+=+x+%2B+30\"\r\n" );
document.write( "\"4%2Ax+%2B+12+=+x+%2B+30\"\r\n" );
document.write( "\"3%2Ax+=+18\" or \"x+=+6\"\r\n" );
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document.write( "So, 6 kg of salt were added to make it 25% concentration.\r\n" );
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document.write( "Hope you got it:)\r\n" );
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