Thank you so much 👍

Simpler method:

76.3 x no. of students = total score
78.1 x no. of students = total score

So try diff numbers, until you get 10

76.3 x 10 = 763
78.1 x 10 = 781

781 – 763 = 18

Since 97 – 79 also = 18, you know that 10 is the correct no. of students

Let then number of children be n

78.1n – 97 = 76.3n – 79

1.8n = 18

n = 10