What is the value of x so that the seven digit number 55350x2 is divisible by 72?
Show answer & explanation
Correct answer: A
Explanation
Correct Answer is option 1 i.e. 7
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Concept |
Understanding |
Application |
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Divisibility rule: If a number is divisible by 72 it must be divisible by 8 and 9 Divisibility by 8: Last 3 digits must be divisible by 8. Divisibility by 9: Sum of all digits should by divisible by 9 |
Number 55350x2is divisible by 72
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Last 3 digits 0x2 must be divisible by 8: Hence, x = 7 or 3 If we put x = 3, then number becomes5535032 which not divisible by 9. If we put x = 7, then number becomes5535072 which divisible by 9. Hence, x = 7 |