Question

If 21y 5 is a multiple of 9,where y is a digit ,what is the vaule of y?

Answer 1

Answer:

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

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

SO y=1 BECAUSE IF WE ADD 1 TO 8 THEN THE SUM WHICH WE GET IS DIVISIBLE BY 9