Maddie swims the hundred meter freestyle in 30 seconds what is her average speed in meters per minute

1 answer:

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Answer: 200 meters per minute

Explanation: we know that she can run 100 meters per 30 seconds. the question is asking in terms of minutes, however. we have to convert the seconds into minutes. How many minutes is 30 seconds? well, 60 seconds are in a minute so 30 seconds are in half a minute. 30 seconds = .5 minutes.

Now, we have to find how many meters she runs per minute. this means how many meters she runs in one minute. we create a proportion:

100 meters/ .5 minutes = x meters / 1 minute

we cross multiply to get 100 = .5x

then, we simplify by dividing each side by .5 which equals

200=x

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Among the eighth-graders in Michael's school, 70% have siblings. The eighth-grade class is 5/6 the size of the seventh-grade cla

trapecia [35]

Answer:

D. 192

Step-by-step explanation:

This problem involves a few steps. First, you need to determine how many eighth graders you have given that 112 represent 70% of the total number of eighth graders. You can solve this using a proportion:

$\frac{70}{100}=\frac{112}{x}$

Cross-multiply and divide: 70x = 11200 or 70x/70 = 11200/70 or x = 160

Since there are 160 total eighth graders and this is $\frac{5}{6}$ of the amount of seventh graders, we can set up an equation to solve for the total amount of seventh graders: