book Maths Puzzle Numerical Ability

In base 11 - what is the largest/smallest/differenct of a number represented by a 3-digit numeral in the form abc where a does not equal 0.

largest 999
smallest 100
difference 899

is this correct?? Thanks Caroline

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book Other Question

Simplify:
3/sqrt 18
2x - 17 = 4x - 19