Answer: The answer is 15.
Step-by-step explanation: Given that there are a total of 60 students who signed up for hockey, where there were 3 boys for every 1 girl who signed up. We are to find the number of girls who signed up.
The ratio of the number of boys to the number of girls will be 3 : 1.
Let '3x' and 'x' be the number of boys and number of girls respectively who signed up.
Therefore, we have
[tex]3x+x=60\\\\\Rightarrow 4x=60\\\\\Rightarrow x=15.[/tex]
Thus, the number of girls is 15.
