document.write( "Question 525559: total of three numbers is 174. If the ratio between 1st and 3rd number is 1:4. And the ratio between 2nd and 3rd number is 9:16. Then what is the 2nd number? \n" ); document.write( "
Algebra.Com's Answer #348147 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! Write an equation for each statement. Simplify each equation as much as you can. \n" ); document.write( "We want to get a & b in terms of a. \n" ); document.write( ": \n" ); document.write( "total of three numbers is 174. \n" ); document.write( "a + b + c = 174 \n" ); document.write( ": \n" ); document.write( " If the ratio between 1st and 3rd number is 1:4. \n" ); document.write( " \n" ); document.write( "Cross multiply \n" ); document.write( "c = 4a \n" ); document.write( ": \n" ); document.write( " And the ratio between 2nd and 3rd number is 9:16. \n" ); document.write( " \n" ); document.write( "Cross multiply \n" ); document.write( "16b = 9c \n" ); document.write( "replace c with 4a \n" ); document.write( "16b = 9(4a) \n" ); document.write( "16b = 36a \n" ); document.write( "Divide both sides by 16 \n" ); document.write( "b = \n" ); document.write( "Reduce fraction \n" ); document.write( "b = \n" ); document.write( "\n" ); document.write( ": \n" ); document.write( "Substitute in the 1st equation \n" ); document.write( "a + \n" ); document.write( "multiply by 4 to get rid of denominators: \n" ); document.write( "4a + 9a + 4(4a) = 4(174) \n" ); document.write( "4a + 9a + 16a = 696 \n" ); document.write( "29a = 696 \n" ); document.write( "a = \n" ); document.write( "a = 24 is the 1st number \n" ); document.write( "Find the 2nd number \n" ); document.write( "b = \n" ); document.write( "b = 9*6 \n" ); document.write( "b = 54 is the 2nd number, which is what they want here \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Find the 3rd number to check the solutions in the 1st equation \n" ); document.write( "c =4(24) \n" ); document.write( "c = 96 \n" ); document.write( "24 + 54 + 96 = 174, confirms our solutions\r \n" ); document.write( "\n" ); document.write( ": \n" ); document.write( " \n" ); document.write( " |