15% of 80 is what?

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Answer 1 · 2016-11-17T16:51:22

#12# is #15%# of #80#. See Explanation.

See what is asked
So we are asked what #15%# of #80# is.
Figure out "plan of attack"
So the best way that there seems to be to solve this problem is making a proportion.
Solve
#x# is to #80# as
#15# is to #100 #

(We are using #100# because #15 %# is out of #100 %#)
Cross multiply
#x# #*# #100 = 15# #xx# #80#
Carry out what multiplication that can be done
#100x##=# #1,200#
Divide both sides by #100#
#x##=# #12#
And there is your answer, #12#.
#12# is #15%# of #80#

You can double check your answer by plugging these numbers, including #12#, back into the proportion.

#12# is to #80# as
#15# is to #100 #
#12 xx 100# #=# #80 xx 15#
✅#1,200 = 1,200#✅

Hope this helps!