Question 465801
Since the discount was 25%, the current price is 75% of the original (25% is what went away).  That means that $90 is 75% of the original.  For these kinds of problems, "is" means "equals" and "of" means "times".  Also, recall that 75%=0.75   So, {{{90=0.75*x}}}  To get x by itself, divide by 0.75 on both sides, and get {{{120=x}}}.  So, the watch was originally $120.