ok so find the percentage of 25% of 24 so it is 6 so you add 6 to the original number and now it’s in total of 30 boys and then you do the opposite for girls. 10% of 20 is 2 so you decrease it by subtracting 2 from 20 which is 18 so you add together is 48 but before the total was 44 so you see how much percent it increased :)