Question

If 21 y 5 is multiple of 9, where y is digit, what is the value of y

Answer 1

Answer:

ACCORDING TO THE DIVISIBILITY RULE OF 9 WE SHOULD ADD ALL THE THE DIGITS AND IF THE SUM IS DIVISIBLE BY 9 THE YOU CAN SAY THAT THE NUMBER IS DIVISIBLE OF 9.

SO 2+1+y+5=8+y.

SO THE VALUE OF y IS 1 AS IF YOU ADD 1 TO 8 THEN THE SUM IS 9 WHICH IS DIVISIBLE BY 9.