Question

40%x X+ X x20%=72

Answer 1

X x ( 40 % +20%)=72

X x60% = 72

X          = 72 :60%

x          = 43,2

Answer 2

k1 nha

Answer 3

49%xX+Xx20%=72

=>Xx(40%+20%)=72

=>Xx60%=72

=>Xx0,6=72

=>X=72:0,6

=>X=120