Posted by maxy on Thursday, December 13, 2012 at 6:36pm.
there was a total of 840 guests at a wedding dinner. 60% of them were adults, and the rest were children. some boys left before the dessert was served. as a result, the percentage of adults increased to 70%. how many boys left before the dessert was served

algebra  Damon, Thursday, December 13, 2012 at 7:12pm
original:
840 total
504 adults
336 children
final
840  b total
504 adults
336  b children
so
504 adults = .7(840 b)
all set?

algebra  Anonymous, Tuesday, February 12, 2013 at 5:23pm
b=132

algebra  Mathster, Tuesday, February 3, 2015 at 10:10pm
120 boys left before dessert was served

algebra  JOHN CENA, Thursday, July 21, 2016 at 2:37pm
60% = 504
30% = 336
Solve by Proportion
504/336x = 7/3
2352  7x = 1512
7x = 840
x = 120
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