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beks73 [17]
3 years ago
11

Jordan’s class has 30 boys. If the students in his class, 60% are girls. How many girls are in Jonathan’s class?

Mathematics
1 answer:
aev [14]3 years ago
4 0

There are 45 girls in Jonathan's class.

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2 years ago
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<em>Roberto's speed in still water is 6 miles/hour and the river speed is 2 miles/hour</em>

Step-by-step explanation:

<u>Relative Speed</u>

When a body is moving at a constant speed v, the distance traveled in a time t is:

d=v.t

When Roberto rows downstream, his speed in still water is added to the speed of the water, making it easier to travel the required distance.

When Roberto rows upstream, his speed in still water is affected by the speed of the water, both are subtracted and the required distance is covered in more time.

Let's call

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d=(x+y).t_1

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2.5x+2.5y=20\qquad[1]

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Thus, Roberto's speed in still water is 6 miles/hour and the river speed is 2 miles/hour

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