15% of 80 is what?

1 Answer
Nov 17, 2016

Answer:

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

Explanation:

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

    (We are using #100# because #15 %# is out of #100 %#)

  4. Cross multiply
    #x# #*# #100 = 15# #xx# #80#

  5. Carry out what multiplication that can be done
    #100x##=# #1,200#

  6. 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!