Write the ratio as a fraction in lowest terms.

1 3/7 to 1 1/5

To write the ratio 1 3/7 to 1 1/5 as a fraction in lowest terms, we first need to convert the mixed numbers to improper fractions.

1 3/7 = (7*1 + 3)/7 = 10/7

1 1/5 = (5*1 + 1)/5 = 6/5

Now, we can write the ratio as a fraction:

10/7 : 6/5

To compare the fractions, we first need to find a common denominator. In this case, the common denominator is 35 (7*5).

Converting the fractions with the common denominator, we get:

(10/7) * (5/5) : (6/5) * (7/7)

= 50/35 : 42/35

Now, we can compare the fractions:

50/35 : 42/35

Since the denominators are the same, we can compare the numerators:

50 : 42

To simplify the fraction, we need to find the greatest common divisor (GCD) of 50 and 42, which is 2.

Dividing both numerator and denominator by 2:

50/2 : 42/2

= 25 : 21

Therefore, the ratio 1 3/7 to 1 1/5 can be written as the fraction 25/21 in lowest terms.