Question

Answer 1

a) \(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+...+\left(x+19\right)=200\)

\(x+1+x+3+x+5+...+x+19=200\)

\(x\times10+100=200\)

\(x\times10=100\)

\(x=100:10\)

\(x=10\)

b) \(x\times\dfrac{1}{2}+\dfrac{5}{6}=\dfrac{11}{6}\)

\(x\times\dfrac{1}{2}=\dfrac{11}{6}-\dfrac{5}{6}\)

\(x\times\dfrac{1}{2}=\dfrac{6}{6}\)

\(x\times\dfrac{1}{2}=1\)

\(x=1:\dfrac{1}{2}\)

\(x=2\)