anonymous
  • anonymous
what is 18 1/15 - 9 3/5
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
you mean 18/15 - 27/5? if so it equals 4.2 or 21/5
yuki
  • yuki
is it\[18 {1 \over 15} - 9 {3 \over 5}\] ?
anonymous
  • anonymous
yes yuki

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yuki
  • yuki
mixed numbers are fairly easy when you understand that it can also be changed into an equivalent improper fraction
anonymous
  • anonymous
ooh 271/15 - 48/5 = 31/5 ? lol i think
anonymous
  • anonymous
which is 6 5/1
yuki
  • yuki
for example, \[18 {1 \over 15}= 18 + {1 \over 15}\] so \[{18*15+1 \over 15} = {217 \over 15}\]
yuki
  • yuki
you do the same thing with the other fraction, but before we do that, we need to make the denominator common. so instead of \[9 {3 \over 5}\] we will use \[9 {9 \over 15}\] which as an improper fraction, is \[{9*15+9 \over 15} = {144 \over 15}\]
anonymous
  • anonymous
Who elsee gott daht?
yuki
  • yuki
now if you subtract them, \[{217 - 144 \over 15} = {73 \over 15}\]
yuki
  • yuki
if you need it as a mixed number, 73 / 15 = 4 remainder 13 so \[4 {13 \over 15}\]
anonymous
  • anonymous
I GOT DIFF.

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