Since tom has twice as much as peter and peter has half as much as Mary this shows that Tom and Mary have the same amount
Tom=$6
Mary=$6
Peter=$3
A rational number can be expressed in the form
where a and b are integers
Otherwise irrational
Note that
,
,
are all irrational
=
→ rational
→ irrational
→ irrational
=
→ rational
→ irrational
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