Collins middle school 180 sixth grade students. If the sixth grade is 30% of the total school, how many students are in the middle school
Mathematics · College · Tue Nov 03 2020
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We know that 100% of the number of students, is the total number of them. Lets call the number of students x. Creating a ratio would help us find the unknown variable. So we will have:
If 30% of x is 180,
Then 100% of x is x.
Cross multiply to create the equations. 30 times x is equal to 100 times 180.
30x=100*180
30x=18000
Divide both sides with 30.
30x/30 = 18000/30
x = 600