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Tanzania [10]
2 years ago
10

Sarah is reading a new book and it has 320 pages. Yesterday she read 60 in 3 hours. If she continues to read at this rate, how l

ong will it it take her to read all 320 pages?
Mathematics
1 answer:
jonny [76]2 years ago
3 0

Answer:

approx 16 hours

Step-by-step explanation:

rounded out this would be the answer, as 320 is not evenly divisible by 60

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50+51+52+...+101=...<br>Can you help me? I do not understand
Dmitriy789 [7]

Suppose

S=50+51+52+\cdots+100+101

At the same time, we can write

S^*=101+100+99+\cdots+51+50

Note that S=S^* (just reverse the sum). Let's pair the first terms of S and S^*, and the second, and the third, and so on:

S+S^*=(50+101)+(51+100)+(52+99)+\cdots+(100+51)+(101+50)

Now, each grouped term in the sum on the right side adds to 151. There are 52 grouped terms on that same side (because there are 50 numbers in the range of integers 51-100, plus 50 and 101), which menas

S+S^*=52\cdot151

But S=S^*, as we pointed out, so

2S=52\cdot151\implies S=\dfrac{52\cdot151}2=3926

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Answer:

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arsen [322]

Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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