Answer: 3/5
Step-by-step explanation: To write the fraction 15/25 in lowest terms, we divide the numerator and the denominator by the greatest common factor of 15 and 25.
Since the factors of 15 are 1, 3, 5, and 15 and the factors of 25 are 1, 5, and 25, the greatest common factor of 15 and 25 is 5.
So we divide the numerator and the denominator of 15/25 by 5 and we get the equivalent fraction 3/5.
15 ÷ 5 = 3
25 ÷ 5 = 5
Therefore, 15/25 written in lowest terms is 3/5.