Question

解方程：1.60％＋25＝40 2.X-10％X=18 3.x+30％X=52 4.（1－25％)X=36

Answer 1

(1)60%X+25=4

0.6X=4-25=-21

X=-21/0.6=-35

(2)X-10%X=18

X-0.1X=18

(1-0.1)X=18

X=18/(1-0.1)=20

(3)X+30%X=52

X+0.3X=52

(1+0.3)X=52

X=52/(1+0.3)=40

(4)(1-25%)X=36

(1-0.25)X=36

0.75X=36

X=36/0.75=48