Find the largest number that will divide 400 , 437 and 542 leaving 9, 12, 15 respectively .

Explanation

To find the largest number that will divide 400, 437, and 542 leaving remainders of 9, 12, and 15 respectively, we can follow these steps:

### Step 1: Subtract the remainders from each number
We first need to subtract the respective remainders from each number:

- For 400, subtract 9:
\( 400 - 9 = 391 \)

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