The answer is 180 since 18/3 = 6 divide 540/3
A) 324
I divided 240 by 20 to get how much it would cost per kg. For each KG the cost is $12. So then I multiplied 12 by what was asked of you (27) which lead me to the answer of 324.
B) 512
Same concept as A. Divide to get how much gasoline is used per mile. That was 4 miles per 1 gas. Multiply 4 by whatever you have been asked for (128). That leads you to 512.
C) 648
Same concept as above.
D) 5,445
Answer: the required sample size = 155
Step-by-step explanation:
If the standard deviation of the prior study is known, then the formula to compute required sample size:
, where E = Margin of error, z* = Critical value,
= populion standard deviation.
Given: E = 3.7 , 
Critical value for 90% confidence = 1.645
Required sample size: 

Hence, the required sample size = 155
12 runners will be needed for the race. 3/4 = 6/8 = 12/16
- Step-by-step explanation:
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