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deannajd03
09.11.2019 •
Mathematics
By 7: 00pm, 1/3 of the junior class had arrived at a school dance. by 8: 00pm, 30 more juniors had arrived, raising the attendance to 1/2 of the junior class. how many people are in the junior class?
a. 30
b. 90
c. 120
d. 180
e. 140
Solved
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Ответ:
The number of people in the junior class = 180 people
Step-by-step explanation:
let number of people in junior class be x
By 7:00PM, 1/3 of the junior class had arrived at a school dance. This means x/3 juniors arrived by 7:00 PM
By 8:00PM, 30 more juniors had arrived, raising the attendance to 1/2 of the junior class. This means that 30 juniors plus 1/3 of the total number of juniors equal 1/2 of the total number of juniors
30 + x/3 = x/2
(90+x)/3 = x/2
Cross multiplying
2(90+x) = 3x
180 +2x = 3x
180 = 3x-2x
180= x
x = 180
Ответ:
The answer is C $ 1,016.50
Step-by-step explanation:
I got i right so yeah