If r and s are two digits of the number 65723rs such that this number is divisible by 40, then r + s = ?(A) 6 (B) 3 (C) 2 (D) 4Options :ABCD
Question
Solution 1
For a number to be divisible by 40, it must end in 00. This is because 40 is a multiple of 10, and any number multiplied by 10 ends in 0. Therefore, in the number 65723rs, r must be 0 and s must also be 0 for the number to be divisible by 40.
So, r + s = 0 + 0 = 0.
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