Question

The successor of a number is written as ⬜▽▽ and the predecessor of the number is ◯⬜◯. If the number is ◯⬜⬜, find the number.

Answer 1

since last two place of number is changing and are same also that means no. should have last two digit should be 99
and since first digit of no. is same to third digit of predecessor so it will be 9-1=8
hence the no will be 899