12 is what percent of 40?

2 Answers
Oct 11, 2016

Answer:

#12# is #color(green)(30%)# of #40#

Explanation:

If #12# is #x%# of#40#
then
#color(white)("XXX")x/100 xx 40 =12#

#color(white)("XXX")40x=1200#

#color(white)("XXX")x=30#

Oct 11, 2016

Answer:

#30%#

Explanation:

A fraction, a decimal and a percent are all equal and are all interchangeable....

#12/40 = 3/10 = 0.3 = 0.30 = 30/100 = 30%#

To change fraction or decimal form to percent, #xx 100%#

#12/40 xx 100%" "# you could cancel as shown in the next steps:

#cancel12^3/(cancel4cancel0) xx (10cancel0)%#

#3 xx10 % = 30%#

You can also do percentage questions using direct proportion - just compare the matching parts.

If #100%# represents #40#, what percent is #12#?

# x/100 = 12/40#

#x = (12xx100)/40#

#=30%#