A25-ounce solution is 20% alcohol. if 50 ounces of
water are added to it, what percent of the new solution is
alcohol?

20% =1/5

1/5 out of 25= 1/5*25/1=25/5=5

So 5oz -amount of ounces of alcohol in solution.

Solution is then 5oz alcohol + 20oz water =25oz

Add 50oz water

25(already existing) + 50 =75oz New solution

Still only 5oz of alcohol

5/75 =0.06666

Convert to percentage by multiplying result with 100.

6.666%

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.