Question 153834
The meter stick he's using is {{{3.5}}} in.
longer than a yardstick.
Suppose he lays the stick on the wall where he wants a 
drapery {{{3}}} times and calls this {{{3}}} yds
The measurement is actually {{{3}}} yds + {{{10.5}}} in
When the drapery arrives, it will be {{{10.5}}} in. smaller
than it should be