Question

Which greatest number should be replace i am so that the number 778m09 is divisible by 3​

Answer 1

$\fbox \color{Red} Answer:-$

A number will be divisible by 3 if it's sum of digits will be divisible by 3

778m09= 33m

As the number 33 is divisible by 3, so we can write m as 0

Answer 2

Answer:

divisibility rule of 3 = sum of face value of all digits should be divisibile by 3.

so 7+7+8+0+9 = 31 it's not divisibile by 3

the greatest number that should be placed in place of m is 8. if 8 is placed sum becomes,

31+8 = 39 n it's divisible by 3

778809/3 = 259603