document.write( "Question 1066687: At a cartain snack bar, a mango shake costs twice as much as slice of pizza.If 2 mango shakes ang 3 slices of pizza costs 90,how much is a mango shake?
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Algebra.Com's Answer #681902 by math_helper(2461) $\"\"$ $\"About$

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Let m=the cost of mango shake
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document.write( "   m = 2p          (1)\r\n" );
document.write( "   2m+3p = 90      (2)\r\n" );
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document.write( "(1) allows us to substitute \"2p\" for \"m\" in (2):\r\n" );
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document.write( "      2(2p) + 3p = 90\r\n" );
document.write( "         4p + 3p = 90\r\n" );
document.write( "              7p = 90\r\n" );
document.write( "               p = 90/7  \r\n" );
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document.write( "    m = 2p = 2(90/7) = 180/7\r\n" );
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document.write( "Ans:  A mango shake costs 180/7  (in whatever units of currency are specified).\r\n" );
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document.write( "Check:   (180/7)*2 + (90/7)*3 = (360/7)+(270/7) = 630/7 = 90  (ok)  \r\n" );
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