Q: What is the ratio or rate as a fraction in simplest form for 21 out of 91?

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50:1

3/8ths =0.375 = 37.5%

9/20 is the simplest form of this fraction. Goldfish and Marbles aren't really comparable unless the goldfish is equivalent to a certain number of marbles. Say the Goldfish cost x and the marbles cost y, a goldfish is then x/y marbles so the answer is 9x/20y. As I don't know x or y, you'll have to simplify that yourself.

A plant every 1.7 feet.

Write 171 miles in 3 hour as a unit rate

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50:1

3/8ths =0.375 = 37.5%

128/56 = 16/7

For people who are not familiar with fractions it is easier to compare them in the form of unit rates.

Fraction = 20/1 Ratio = 20

9/20 is the simplest form of this fraction. Goldfish and Marbles aren't really comparable unless the goldfish is equivalent to a certain number of marbles. Say the Goldfish cost x and the marbles cost y, a goldfish is then x/y marbles so the answer is 9x/20y. As I don't know x or y, you'll have to simplify that yourself.

A plant every 1.7 feet.

You divide it by 4.5 and then put it as a fraction

102 miles to 4 minute = 51 miles to 2 minutes

Write 171 miles in 3 hour as a unit rate

Find an equivalent ratio so that the denominator = 1. This may require the numerator to be a fraction.

the same as a unit rate just in fraction form