Question

The number 7490 xy is divisible by 90 find out x + y

Answer 1

Answer:

X = 7 and Y = 0.

X + Y = 7 + 0 = 7

Step-by-step explanation:

Hey Mate,

The  divisibility rule of 90 : If the number divided by 9 and 10 then its also divide by 90.

The  divisibility rule of 9 : If the sum of all number is divided by 9 then the whole number is divided by 9.

The  divisibility rule of 10 : If any number end with "0" or unit digit of any number is "0" then the whole number is divided by 10.

The Number is 7490XY.

Y is definitely 0 then its divide by 10

Now we have to find the X.

7 + 4 + 9 + 0 + X + 0 = 20 + X.

So the nearest number which divide by 9 is 27 .

So X = 7,

20 + 7 = 27 and its divide by 9.

So, 749070 is a number which completely divide by 90.

When X = 7 and Y = 0.

So, X + Y = 7 + 0 = 7