Question 853257
Let's find a common denominator first.  What number do both 10 and 6 go into?  I can see right off that 30 will work (it doesn't HAVE to be the lowest common denominator; you can always reduce later).
{{{3/10}}}= how many 30ths?  Multiply top and bottom by 3 to get {{{9/30}}}
{{{1/6}}}= how many 30ths?  Multiply top and bottom by 5 to get {{{5/30}}}
Add them together
{{{9/30}}}+{{{5/30}}}={{{14/30}}}
If he spends {{{14/30}}}, then there will be 30-14, or {{{16/30}}}left over.
What number can you reduce that fraction to?