If 2q3₅ = 77₈, find q

Find r, if 6r7₈ = 511₉

If 55_x +52_x =77₁₀, find x

Subtract 16418₉ from 18630₉

If 125_x = 20₁₀ find x

Add 1101₂, 10111₂ , and 111₂

If X₁₀ = 1214₅, find X

Evaluate $1011_{2}^{2}-101_{2}^{2}$

If $(k{{2}_{6}})\times 6={{3}_{5}}{{(k4)}_{5}}$ what is the value of k

Compute  110011₂ + 11111₂