The number of children in 1989 is:

Given :- Total population in 1988 = 146947 , increase = 11630
Total population in 1989 = Total population in 1988 + increase = 146947 + 11630 = 158577
∴ The number of children in 1989 = Total population in 1989 − ( Total number of men in 1989 + Total number of women in 1989 )
= 158577 − (70391 + 62516) = 25670.