I'm not 100% sure but i think it is 35x+13
Answer:
The last part.
Step-by-step explanation:
The error is only at the last part. Basically the answer part.
The answer should be —

We don't multiply the square roots when adding or subtracting. That'd contradict the rules.
Here, we let the square root of five as x-term.


As we add up, we would get 13x. Thrn we convert x-term back to square root of five.
The answer would be —

Remember that we don't multiply the square roots when adding or subtracting.
A.) when there are 24 boys, there are 36 girls.
b.) If there are 80 students, there are.... 48 girls.
c.) If there are 75 students...... there are 15 more girls than boys.
Let me know if you need me to show you how I got this.