Kim surveyed 80 students at her school and found that 0.65 of the students she surveyed said their favorite class is math. Another 15% of the students she surveyed reported that their favorite class is science. How many more students in the survey prefer math over science?
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OpenStudy (freckles):
well 65% of 80 preferred math
what is .65(80)
and 15% of 80 preferred science
what is .15(80)
OpenStudy (anonymous):
12
OpenStudy (freckles):
then find the difference
OpenStudy (freckles):
.15(80)=12
.65(80)=?
OpenStudy (anonymous):
52
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OpenStudy (freckles):
that means 12 people preferred science (since .15*80=12)
now we want to know how many of the 80 preferred math (this is where you need to calculate .65*80
OpenStudy (freckles):
and yes
OpenStudy (freckles):
so you have 12 people prefer science
and 52 prefer math
OpenStudy (anonymous):
.65(80) is 52
OpenStudy (anonymous):
so now what do i do?
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OpenStudy (freckles):
find the difference
OpenStudy (anonymous):
so 52-12=30?
OpenStudy (freckles):
5-1=4 I believe
so 52-12=40
so 40 people preferred math over science