The percent of her markers that were not working is 65%
How to find how much percent 'a' is of 'b'?
Suppose a number is 'a'
Suppose another number is 'b'
We want to know how much percent of 'b' is 'a'.
Then, it is calculated as:
[tex]\dfrac{a}{b} \times 100[/tex] (in percentage)
The number of her markers not working = Total number of markers - number of markers working = 20 - 7 = 13
Thus, the percent of her total markers the markers not working is:
[tex]\dfrac{13}{20} \times 100 = 65\%[/tex]
Second method:
Let us suppose that 'p' percent of her markers are not working, then, as 13 of her markers are not working, so they are equal, or:
[tex]\dfrac{20}{100} \times p = 13\\\\\dfrac{p}{5} = 13\\\\\text{Multiplying 5 on both the sides}\\p = 65 \text{\: \:(In percentage)}[/tex]
Thus, the percent of her markers that were not working is 65%
Learn more about percent here:
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