Question

Find the value of X,the number 1245X40 is divisible by 15

Answer 1

Answer:

1245X40 is divisible by 15 only if it is divisible by 3 and 5

to find whether 1245X40 is divisible by 3 ,we will add the digits in 1245X40

so we get 16 + X,

in order to get divisible by 3 , X = 2

so the number becomes 1245240

let us confirm whether 1245240 is divisible by 5

so 1245240/5= 249048, yes it is divisible by 5

so, the value of X = 2