Question 106145
during a recent telethon, people pledged $25 or $50. 
twice as many people pledged $25 as $50. all together, 
$18,000 was pledged. how many people pledged $25? 
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Let # of $50 pledges be "x" ; value of these is 50x dollars
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# of $25 pledges is "2x"; value of these is 25(2x)= 50x dollars
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EQUATION:
value + value = 18000 dollars
50x + 50x = 18000
100x = 18000
x = 180 (# of $50 pledges)
2x = 360 (# of $25 pledges)
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Cheers,
Stan H.