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Let x be the total population of the students at the school.
Then 30% of the population is 0.3x.
Therefore, from the condition, you have this equation
0.3x = 150.
To solve it. divide both sides by 0.3.
In this way, you will get
x =
=
= 500.
ANSWER. There are 500 students at the shcool.
Solved.