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Part ACSIR NET June 2025the-units-digit-cancels-leaving-9a-so-the-quotient-is-the-tens-digit

The units digit cancels leaving 9a so the quotient is the tens digit

Sum of the digits of a two-digit number 'ab' is subtracted from the number and the result is divided by 9. Then the result of this will be

  1. A.always a✓
  2. B.always b
  3. C.neither a nor b
  4. D.either a or b depending on a+b

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward, and why this one tests execution slip.

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50 are analysed free — try those first.

The trap it tests

Execution slip

The idea was right. The computation was not.

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