Question 51

What is the value of x so that the seven digit number 5656x52 is divisible by 72?

Solution

To be divisible by 72 it should be divisible by 8 and 9

8 division rule is last 3 digits should be divisible by 8.

9 division rule is sum all the digits should be divisible by 9.

Only option satisfying is 7

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