(1)60%X+25=40,
60%X+25-25=40-25,
60%x=15,
60%x÷60%=15÷60%,
x=25;
(2)X+12.5%X=72,
1.125x=72,
1.125x÷1.125=72÷1.125,
x=64;
(3)75%X-
=0.5X,1 16
75%X-
+1 16
=0.5X+1 16
,1 16
75%x-0.5x=0.5x+
-0.5x,1 16
0.25x=
,1 16
0.25x÷0.25=
÷0.25,1 16
x=
;1 4
(4)X×(1-25%-20%)=550,
55%x=550,
55%x÷55%=550÷55%,
x=1000.