If  x,  y,  and  z,  be  three  of  the  parts,  the  fourth  will  be
90 — x — y — z.  And  by  the  conditions,  &c.
Prob.  53.  Find  three  numbers,  such  that  the  first  with  J
the  sum  of  the  second  and  third  shall  be  120 ;  the  second  with
i  the  difference  of  the  third  and  first  shall  be  70 ;  and  J  the
sum  of  the  three  numbers  shall  be  95.
