Question

X +X : 0,5 + X : 0,25 + X :0,125 =15

Answer 1

=>x+2x+4x+8x=15

=>15x=15

=>x=1

Answer 2

\(x+x:0,5+x:0,25+x:0,125=15\)

\(x+x:\dfrac{1}{2}+x:\dfrac{1}{4}+x:\dfrac{1}{8}=15\)

\(x+x\times2+x\times4+x\times8=15\)

\(x\times\left(1+2+4+8\right)=15\)

\(x\times15=15\)

\(x=15:15\)

\(x=1\)