TBQ - Find the digit — task. Maths CBSE Live product, Class 8 (2025-26).

If \(31z5\) is a multiple of \(9\), where \(z\) is a digit, obtain the value of \(z\). Explain why there are two answers to this problem.

\(z =\) or

(Note: Enter the numbers in ascending order.)

There are two solutions because

\(z\) takes values from \(0\) to \(9\) and there are \(5\) multiples within this range.
\(z\) takes values from \(0\) to \(9\) and there are \(2\) multiples within this range.
\(z\) takes values from \(0\) to \(10\) and there are \(2\) multiples within this range.
\(z\) takes values from \(1\) to \(9\) and there are \(2\) multiples within this range.

Did you find an error?

11. TBQ - Find the digit