Solution
Correct Answer: Option A
Let the number be 'x'.
According to the question,
The student multiplied by 52 instead of 25.
So, the wrong result is 52x and the correct result is 25x.
Difference between the two results:
52x - 25x = 324
Or, 27x = 324
Or, x = 324 / 27
∴ x = 12
So, the number to be multiplied was 12.
শর্টকাট টেকনিক (MCQ এর জন্য):
নির্ণেয় সংখ্যা = পার্থক্য / (ভুল সংখ্যা - সঠিক সংখ্যা)
= 324 / (52 - 25)
= 324 / 27
= 12