There are 25 students in total, as per linear equation.
What is a linear equation?
"A linear equation is an equation in which the highest power of the variable is always 1. It is also known as a one-degree equation."
Given, in a group of students, the ratio of girls to boys is 3:2.
There are 15 girls in that group.
Let, total students are x.
Therefore, x(3/5) = 15
⇒ x = 15 × 5/3
⇒ x = 25
Learn more about linear equation here: https://brainly.com/question/12425063
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