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thier are 357 seniors in harris high school the ratio of boys to girls is 7:10 how many girls are in the senior class?
Guest Apr 11, 2012
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b: # of boys
g: # of girls

kymberlee17:

thier are 357 seniors in harris high school


b+g=357
kymberlee17:

the ratio of boys to girls is 7:10


b/g=7/10


b+g=357
b/g=7/10 <=> b=g*7/10

(g*7/10)+g=357
g*(7/10+1)=357
g=357/(7/10+10/10)
g=357/(17/10)
g=357*(10/17)=210
=>
b=357-210=147

[input]solve( b+g=357, b/g=7/10 )[/input]
admin  Apr 11, 2012

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