Answer :

[tex]\frac{45}{75}= \frac{3*15}{5*15}= \frac{3}{5}[/tex]
45/75 *5 so 45/5=9    75/5=15   =9/15 both can go into 3s so 9/3=3       15/3=5        so that is 3/5                                                                                                                                          so yes 45/75 is equivalent to 3/5