Question 1162019
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<pre>

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 = {{{150/0.3}}} = {{{1500/3}}} = 500.


<U>ANSWER</U>.  There are 500 students at the shcool.
</pre>

Solved.