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Which digit should replace A in the units place of the number 987,654,32A so that the number is divisible by 7?

 Nov 28, 2020
 #1
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0

Just try  0      divide by 7  if not    try  1   divide by 7    if not try 2   divide by 7   if not......

    (if it is 0 1 2  there will be a second one that will work)

 Nov 28, 2020
 #2
avatar+2533 
+1

let's say A=0

987,654,320/7 = 141093474.286

 

the .286 represents that we are 1 - 0.286 = 0.714 off from making 987,654,320 to be divisible by 7 wholly, therefore:

987,654,320 + 7 * 0.714 = 987,654,325

 Nov 28, 2020

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