Question

Transform $21125$ from scale seven to scale eleven.

Answer 1

$21125$ from scale 7 to denary is $5\times 7^0+2\times 7^1+1\times 7^2+1\times 7^3+2\times 7^4=5213$

When $5213$ is divided by $11$ quotient is $473$ and remainder is $10$
When $473$ is divided by $11$ quotient is $43$ and remainder is $0$
When $43$ is divided by $11$ quotient is $3$ and remainder is $10$

Hence, the number in scale of eleven is $3t0t$