Question #f5f91

1 Answer
James M.
Dec 1, 2017

#30#

Explanation:

If you mean "#12# is #40%#of what?" Then, we can look at 40% as a decimal, which would be #0.4#.

The number we are looking for can be written as #x# so #0.4# of #x# should be #12#.

Writing this as an equation we see #0.4x = 12#. Rearranging this equation by dividing everything by #0.4# would give us #x = 12/0.4#

#12/0.4# is #30# because #12 -: 4/10# is the same as #12 xx 10/4# which gives:

#120/4 --> 30#

Hope this helps!

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