document.write( "Question 64191: A movie theater sells two different size boxes of popcorn. The large box costs $3 and the small box costs $2. In one day, the theater sold 657 boxes of popcorn for a total of $1612. How many of each size were sold? (Use a four-column table.) \n" ); document.write( "
Algebra.Com's Answer #44837 by burkus(4)![]() ![]() ![]() You can put this solution on YOUR website! LARGE = 3.00 \n" ); document.write( "small = 2.00 \n" ); document.write( "657 boxes on day \n" ); document.write( "1612 total on day \n" ); document.write( "Let L be the number of boxes of LARGE \n" ); document.write( "Let s be the number of boxes of small \n" ); document.write( "L + s = 657 \n" ); document.write( "L * 3.00 + s * 2.00 = 1612.00 \n" ); document.write( "two equations and two unknowns\r \n" ); document.write( "\n" ); document.write( "Let's subsitute for L using s, from the L + s = 657 equation. \n" ); document.write( "L + s = 657 \n" ); document.write( " L = 657 - s\r \n" ); document.write( "\n" ); document.write( "and plugin to the second equation, gives\r \n" ); document.write( "\n" ); document.write( "( 657 - s ) * 3.00 + s * 2.00 = 1612.00\r \n" ); document.write( "\n" ); document.write( "1971 - s * 3.00 + s * 2.00 = 1612.00\r \n" ); document.write( "\n" ); document.write( "subtract 1971 from both sides\r \n" ); document.write( "\n" ); document.write( "-s * 3.00 + s * 2.00 = 1612 - 1971 \n" ); document.write( "-3 s + 2 s = 1612 - 1971 \n" ); document.write( "-1 s = 1612 - 1971 \n" ); document.write( "-s = -359 \n" ); document.write( "or s = 359.\r \n" ); document.write( "\n" ); document.write( "Plug this new found value for s back into the original equation, \n" ); document.write( "and get L\r \n" ); document.write( "\n" ); document.write( "L + s = 657 \n" ); document.write( "L + 359 = 657 \n" ); document.write( "L = 657 - 359 \n" ); document.write( "L = 298\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "So, in answer to how many of each boxes were sold on that day, \n" ); document.write( "298 Large and 359 small boxes were sold. \n" ); document.write( " \n" ); document.write( " |