Question 940841
AL=Actual Length=16 feet
DL=Drawn Length=4 inches
Scale=AL/DL (units must have same dimension, i.e. feet and feet, not feet and inches)
First change DL units to feet:
{{{DL=4 inches(1 foot/12 inches)}}} Note numerator and denominator of conversion factor are equivalent, so we are multiplying by 1, which does not change the value.
{{{DL=4 foot/12}}}  Divide out the inches
{{{DL=1/3 foot}}}   Simplify
Scale =AL/DL=16 feet/1/3 foot=48 Note: Scale has no units
ANSWER Vivian's drawing scale is 48:1