If the 8-digit number is 789x 531y is divisible by 72, then the value of (5x — 3y) is?Options-1210
Question
Solution 1
The number 72 is a product of 8 and 9. For a number to be divisible by 72, it must be divisible by both 8 and 9.
For a number to be divisible by 8, the last three digits must be divisible by 8. So, 31y must be divisible by 8. The possible values of y are 2, 6.
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