8 is what percent of 40?

1 Answer
sente
Feb 1, 2017

#8# is #20%# of #40#.

Explanation:

When we say that something is #x# percent of #y#, we mean that it is #y xx x/100#. So, if we say that #8# is #x# percent of #40#, that means that #8 = 40 xx x/100#. Solving for #x#, we get

#8 = 40 xx x/100#

#=> 8 = (40x)/100#

#=> 8 xx 100/40 = (40x)/100 xx 100/40#

#=> 8 xx 5/2 = x#

#:. x = 20#

Thus #8# is #20# percent of #40#.

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