Explanation:
1011₂ + x₇ = 25₁₀ = 1011₂ = 1 x 2³ + 0 x 2² + 1 x 2¹ + 1 x 2^o
= 8 + 0 + 2 + 1
= 11₁₀
x₇ = 25₁₀ - 11₁₀
= 14₁₀
\(\begin{array}{c|c}
7 & 14 \\ 7 & 2 R 0 \\ & 0 R 2
\end{array}\)
X = 20₇