65:100 because there are 65 girls and then 65 girls + 35 boys = 100 total students
Answer:

Step-by-step explanation:
x² = 19x + 12
⇔ x² - 19x - 12 = 0
Calculating the discriminant :
b² - 4ac = (-19)² - 4×1×(-12) = 409
The discriminant is positive ,then the equation has two solutions.

25----------5 and 5--------------5 and 1 ------------5 and 1