45 seventh graders at Jonathan‘s school are not participating in the school play.
Given:
In Jonathan's school,30 seventh graders are participating in the school play. And 60% are not participating in the school play.
To find:
The number of seventh graders not participating in the school play.
Solution:
Let the total number of seventh grader be N.
Number of seventh graders participating in the school play = 30
Percentage of seventh graders not participating in the school play= 60%
Percentage of seventh graders participating in the school play:
[tex]= 100\% - 60\% = 40\%[/tex]
This means that 30 seventh graders are 40% of the total seventh graders, N.
[tex]40\%=\frac{30}{N}\times 100\\N=\frac{30}{40}\times 100=75[/tex]
The number of seventh grader not participating in the school play:
[tex]=N -30\\ = 75 - 30 = 45[/tex]
45 seventh graders at Jonathan‘s school are not participating in the school play.
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