Answer:
Girls ---> 40% Boys ----> 60%
Explanation:
It is given 10 are girls, which logically implies, 15 are boys.
Now given that the total number of children in the class is 25,
Percentage of girls = 10/25 x 100 = 40%
You could do the same for boys by doing 15/25 x 100, or use some logic and realise that two sets should have a percentage of 100, therefore the percentage of boys in the class is 60%