# algebra

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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 -

original:
840 total
336 children

final
840 - b total
336 - b children

so
all set?

• algebra -

b=132

• algebra -

120 boys left before dessert was served

• algebra -

60% = 504
30% = 336

Solve by Proportion
504/336-x = 7/3

2352 - 7x = 1512
-7x = -840
x = 120

• algebra -

120

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