Answer:
The answer is 19.5 miles per hour.
Step-by-step explanation:
If it takes Louisto reach the store 15 minutes at 6 miles per hour, the distance between the store and his home is 1.5 miles.
His speed travelling back is 20 miles per hour, which means that the 1.5 mile trip is completed in 4.5 minutes.
The total time he travels is 19.5 minutes and the total distance is 3 miles, so his average speed is Vavg = (3 * 60) / 19.5 = 9.23 miles per hour.
I hope this answer helps.
Answer:
25 students take both subjects.
Step-by-step explanation:
Solve for 60% of 300 students:
60/100 = x/300
Cross multiply:
60 × 300 = 100 × x
18000 = 100x
Divide both sides by 100:
180 = x
Solve for 20% of 300 students:
20/100 = x/300
20 × 300 = 100 × x
6000 = 100x
60 = x
Solve for the percentage of students in chemistry:
x/100 = 35/300
x × 300 = 100 × 35
300x = 3500
x = 11.66666...7
x = about 11.7%
Find the difference in percentages:
100 - 60 - 20 - 11.7
8.3
8.3% take both subjects
Solve for 8.3% of students:
8.3/100 = x/300
8.3 × 300 = 100 × x
2490 = 100x
24.9
About 25 students
Check your work by adding all the students together (to get to 300):
25 + 60 + 180 + 35
300 students total
This is correct!
2/3 is already down to it's lowest fraction if you wanted to make the fraction bigger, then multiply the 2 times 3 and the 3 times 2 !
C & D are the correct answers