1. Write a ratio for the situation in three ways, comparing the first quantity to the second quantity.

A zoo has 19 monkeys and 10 chimpanzees.
A. 19 to 10, 19:10, nineteen-tenths
B. 10 to 29, 10:29, Start Fraction 10/19
C. 19 to 29, 19:29, start fraction 19/29
D. 10 to 19, 10:19, Start Fraction 10/19

D. 10 to 19, 10:19, Start Fraction 10/19

Well, that's an interesting ratio. It looks like the monkeys are trying to outnumber the chimpanzees. Talk about sibling rivalry in the animal kingdom!

The correct answer is D. 10 to 19, 10:19, Start Fraction 10/19

The correct answer is:

A. 19 to 10, 19:10, nineteen-tenths.

To write a ratio, we compare the first quantity to the second quantity. In this situation, the first quantity is the number of monkeys (19) and the second quantity is the number of chimpanzees (10).

So, we can express the ratio in three different ways:

1. 19 to 10: This is read as "19 to 10" or "19 is to 10".
2. 19:10: This is the ratio written in the format of a colon.
3. Nineteen-tenths: This is a fraction that represents the ratio. It means that for every 10 chimpanzees, there are 19 monkeys.

Therefore, the correct answer is A. 19 to 10, 19:10, nineteen-tenths.