Question 74

What is the value of x so that the seven digit number 55350x2 is divisible by 72?

Solution

Break 72 into prime factors

72 = $$ 2^3 \times 3^2$$

Rule for 2 : last digit should be even.

Rule for 3 : Sum should be divisible by 3.

For 55350x2 to be divisible by 72 , x = 7.

So , the answer should be option c)7.

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