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

504/336-x = 7/3

2352 - 7x = 1512

-7x = -840

x = 120

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