Pretty sure the answer is k
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<u>Step-by-step explanation:</u>



Answer:
62 is 90.5% of what number? 68.51 (I think)
The unit rate represents 2 miles in 0.25 hour is 8 miles per hour
Step-by-step explanation:
Let us revise the meaning of rate and unit rate
1. A rate is a ratio that is used to compare different types of quantities
2. A unit rate shows how many units of the first type of quantity
corresponds to one unit of the second type of quantity
Examples:
Cost per item
Distance per hour
∵ Zephra ran 2 miles in 0.25 hour
- To find the unit rate make the denominator of the ratio = 1
∵ The unit rate = 
- Divide up and down by 0.25
∵ 2 ÷ 0.25 = 8
∵ 0.25 ÷ 0.25 = 1
∴ The unit rate = 
∴ The unit rate = 8 miles per hour
The unit rate represents 2 miles in 0.25 hour is 8 miles per hour
Learn more:
You can learn more about rate in brainly.com/question/9533500
brainly.com/question/317616
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First, pass all the rate of inflation to ballons/hour
John: 1 b/15s * 3600 s/h = 240 b/h
Jamie: 1 b/20s * 3600 s/h = 180 b/h
Jake: 180 b/h
Then sum the rates to obtain the total rate
Total ballons per hour: 240 b/h + 180 b/h + 180b/h = 600 b/h
If it passes x hours the number of ballons inflated is 600*x
The number of ballon defective are 600*x/80
The number of ballons effectiveley inflated = 600x -600x/80 = 600x - 7.5x = 592.5x.
Answer: option A)