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Answer 1 · 2018-02-11T14:56:13

#20%#

One solution: #4 " is " 1/5 " of " 20# (number of students)

#rarr 1/5 = 20 %#

Another solution: #20/100= 0.2, and 0.2 " is " 1%#

(total number of students divided by #100= 1 %#)

#4/0.2=20, #

(we divided 4 by the number of students and we have a result)

Answer 2 · 2018-02-11T15:32:34

#20%#

To find out what percent one number is of another:

first write it as a fraction.
We have #4# students out of #20# students ... #rarr 4/20#
To calculate as a #%#:
#"fraction" xx 100%#

#4/20 xx100%#

#=20%#

Note that #4/20 = 1/5#

#1/5 xx 100 = 20#