SOLUTION: One day 10% of the students enrolled in the school were absent. There were 1,620 students present on that day. How many students were absent?

Question 1066205: One day 10% of the students enrolled in the school were absent. There were 1,620 students present on that day. How many students were absent?
Found 2 solutions by Boreal, ikleyn:
Answer by Boreal(15235)   (Show Source): You can put this solution on YOUR website!
total number of students that day=1620
total number of students enrolled in school is x
10% of x were absent
Therefore, 90% of the students in the school=1620
Divide 1620 by 0.9 to get 1800.
10% absent, which is what they want is 10% of 1800, or 180. ANSWER
You may set it up as a proportion, too.
.9/1620=1/x and cross multiply.

Answer by ikleyn(52775)   (Show Source): You can put this solution on YOUR website!
.
Let x be the total population of students in the school.
You are given 0.9x = 1620.

Then x = = 1800.

10% of 1800 is 0.1*1800 = 180.

Answer. 180 students were absent that day.

There is a bunch of lessons on percentage problems
    - Percentage problems
    - Percentage word problems (Type 1 problems, Finding the Part)
    - Percentage word problems (Type 2 problems, Finding the Rate)
    - Percentage word problems (Type 3 problems, Finding the Base)
in this site.

Read them and become an expert.

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