a) x+y+z=217005
×=?
y=1708; z=48267
x+1708+48267=217005
x+49975=217005
x=217005-49975
x=167030
b) x+y+z=217005
y=?
x=75109; z=6083
75109+y+6083=217005
y+75109+6083=217005
y+81192=217005
y=217005-81192
y=135813
c)x+y+z=217005
z=?
x=8051;y=93146
8051+93146+z=217005
101197+z=217005
z=217005-101197
z=115808