document.write( "Question 977625: Larry paid 2520 for a watch, a radio, and a calculator. The watch cost 180 more than the radio and the radio cost 120 more than the calculator. How much did each item cost? \n" ); document.write( "
Algebra.Com's Answer #599180 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! Larry paid 2520 for a watch, a radio, and a calculator. The watch cost 180 more than the radio and the radio cost 120 more than the calculator. How much did each item cost? \n" ); document.write( "-----------------\r \n" ); document.write( "\n" ); document.write( "Equatiions: \n" ); document.write( "w + r + c = 2520 \n" ); document.write( "w = r + 180 \n" ); document.write( "r = c + 120 \n" ); document.write( "--------- \n" ); document.write( "Substitute for w and c and solve for \"r\":: \n" ); document.write( "(r+180) + r + (r-120) = 2520 \n" ); document.write( "--------- \n" ); document.write( "3r + 60 = 2520 \n" ); document.write( "3r = 2460 \n" ); document.write( "r = 820 (cost of the radio) \n" ); document.write( "----- \n" ); document.write( "w = r + 180 = 1000 (cost of the watch) \n" ); document.write( "c = r-120 = 700 (cost of the calculator) \n" ); document.write( "---------------- \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " |