The rate is a <em>fraction</em> that compares the values of <em>two quantities</em>. The <u>expected</u> answers to the questions are given below:
1. Given that <u>3</u> cakes takes <u>6</u> hours to bake, then:
1 cake = 
= 2 hours
So that;
the <em>number </em>of cake to be baked in 12 hours = 
= 6
The <em>number</em> of cake to be baked in <u>12</u> hours is 6.
2. Ava's rate of pay = 
= $7.5 pr hour
Thus Ava's rate of pay is $7.5 per hour.
3. It took 5 hours to mow 6 yards. Thus;
To mow 1 yard =
hours
The <em>number</em> of yards to be mowed in 20 hours = 20 ÷ 
= 20 x 
= 24
The number of yards to be mowed in <em>20</em> hours is <u>24</u>.
4. Given that <u>10</u> bags of rice cost $12, then;
1 bag = 
= 1.2
1 bag = $1.2
The cost of a bag of rice is $1.2.
5. Rate = 30 miles per gallon
The number of gallons required = 
= 12
Thus 12 gallons would be required by the car to travel <u>360 miles</u>.
6. Rate = 
= 25
Rate = 25 words per minute
The typing <em>speed</em> is 25 words per minute.
For more on rate, check: brainly.com/question/119866