Its 1+20x because you would subtract 2-1-=1 and 35x-15x=20x im sorry this is the real correct answer
60% of 20 quizzes = 60/100*20 quizzes = 12 quizzes
Amount of quizzes remaining = 50 quizzes - 20 quizzes = 30 quizzes
He passes 80% of those 30 quizzes, so
80/100 * 30 quizzes = 24 quizzes
So, he passed 12 quizzes from the initial bunch and 24 quizzes from the rest, which totals to 12 quizzes + 24 quizzes = 36 quizzes.
Then, you see that he passed 36 quizzes, out of the total 50 quizzes, so the ratio is 36 quizzes / 50 quizzes = 36/50, which when converted as a percentage is 36/50 * 100% = 72%.
Therefore, he passed 72% of the quizzes for the entire year.
Answer:
333.3 meters per minute
Step-by-step explanation:
<u>The best way to solve this problem is using </u><u>dimensional anaysis</u><u>. First, we write out our starting units, that being 20km/1hr. We have to keep in mind that we want to change the kilometers to meters and the hours to minutes.</u>
![\frac{20km}{1hr}](https://tex.z-dn.net/?f=%5Cfrac%7B20km%7D%7B1hr%7D)
<u>We know that there are 1000 meters in 1 kilometer. We add this to the dimensional analysis as 1000m/1km. We write it as this because we want the kilometers to cancel each other out. We only want the meters.</u>
![= \frac{20km}{1hr} *\frac{1000m}{1km} ...](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B20km%7D%7B1hr%7D%20%2A%5Cfrac%7B1000m%7D%7B1km%7D%20...)
<u>We also know that 1 hour is 60 minutes. We add this to the analysis as well so that the hours cancel each other.</u>
![= \frac{20km}{1hr} *\frac{1000m}{1km} * \frac{1hr}{60min}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B20km%7D%7B1hr%7D%20%2A%5Cfrac%7B1000m%7D%7B1km%7D%20%2A%20%5Cfrac%7B1hr%7D%7B60min%7D)
<u>We now solve this expression. Since both the kilometers and the hours cancel out, we have meters per minute as our unit. All that's left are the numbers.</u>
= (20*1000*1)/(1*1*60) m/min
= 333.3 meters per minute