Question

Write the smallest digit and the greatest digit in the blank space of each of the following number so that the number formed is divisible by $3$ ?
_$6724$

Answer 1

$6+7+2+4=19$
if we add 2 then the digit is divisible by 3 $(19+2=21)$

2 is the smallest digit

$26724=2+6+7+2+4=21$

if we add 8 then the digit is divisible by 3 $(19+8=27)$

8 is the largest digit
$86724=8+6+7+2+4=36$