Yesterday, between noon and midnight, the temperature went down by 15.4°F. If the temperature was -3.1°F at midnight, what was it at noon?

12.3 degrees

Step-by-step explanation:

-3.1 degrees + 15.4 degrees = 12.3 degrees

1 cup of milk is used with  

3

4

cup of water

Explanation:

A comparison between the cups of milk and cups of water can be written as a ratio:

Note that:  

1

3

>

1

4

milk : water

1

3

:

1

4

←

×

12

to get rid of fractions

12

1

×

1

3

:

12

1

×

1

4

4

:

3

4 cups of milk are used with 3 cups of water  

←

÷

4

1 cup of milk is used with  

3

4

cup of water