In a city, $30 \%$ are females, 40% are males and remaining are children. What per cent are children?
Given: In a city $30$ % are females and $40$ % are males and the remaining are children.
To find: We have to find the percentage of children in the city.
Solution:
Total percent $=100$ %
Females$=30$ %
Males$=40$ %
So,
Children$=100$ %$-(30$ % $+40$ %$)$
Children$=100$ %$-70$ %
Children$=30$ %
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