Question

x/4 + x/8 + x : 2 = 21/8

Answer 1

\(\dfrac{x}{4}+\dfrac{x}{8}+x:2=\dfrac{21}{8}\\ x\times\left(\dfrac{1}{8}+\dfrac{1}{4}+\dfrac{1}{2}\right)=\dfrac{21}{8}\\ x\times\dfrac{7}{8}=\dfrac{21}{8}\\ x=3.\)

Answer 2

\(\dfrac{x}{4}\) + \(\dfrac{x}{8}\) + \(\dfrac{x}{2}\) = \(\dfrac{21}{8}\)

\(x\) \(\times\) ( \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{2}\)) = \(\dfrac{21}{8}\)

\(x\) \(\times\)  \(\dfrac{7}{8}\) = \(\dfrac{21}{8}\)

\(x\)          = \(\dfrac{21}{8}\) : \(\dfrac{7}{8}\)

\(x\)          = 3

Answer 3

\(\dfrac{x}{4}+\dfrac{x}{8}+\dfrac{x}{2}=\dfrac{21}{8}\)

\(\left(\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{2}\right).x=\dfrac{21}{8}\)

\(\left(\dfrac{2}{8}+\dfrac{1}{8}+\dfrac{4}{8}\right).x=\dfrac{21}{8}\)

\(\dfrac{7}{8}.x=\dfrac{21}{8}\)

\(x=\dfrac{21}{8}:\dfrac{7}{8}\)

\(x=\dfrac{21}{8}.\dfrac{8}{7}=3\)