Number of Students: In a certain school 80% of the students in first-year chemistry have had algebra. If there are 280 students in first-year chemistry, how many of them have had algebra?

Number of Students: In a certain school 80% of the students in first-year chemistry have had algebra. If there are 280 students in first-year chemistry, how many of them have had algebra?
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Step 1
Total number of students in first year chemistry is 280.
In which, 80% students have had algebra.
Therefore, $280×\frac{80}{100}=28×8=224$
Step 2
That is, 224 students have had algebra.
The number of students doesn’t had algebra is,
$280-224=56$
Step 3
Result: