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umka2103 [35]
3 years ago
13

70% of the 100 students in a middle school cafeteria bought their lunch. Some of the students that bought there lunch leave the

cafeteria to attend a assembly. Now only 60% of the remaining students bought there lunch. How many students are remaining in the cafeteria? Explain.
Mathematics
2 answers:
Fittoniya [83]3 years ago
5 0
600 because 60 percent of 100 is 600
ale4655 [162]3 years ago
3 0
70% of 100 is 70and 60% of 100 is 60.
70% bought lunch and 30% didnt, so that means 79 bought lunch and 30 didn't. onky people who bought lunch left, so the 30% remained. but 60% of the students bought lunch stayed in the cafeteria. 30%+60%=90% . 90% is 90 students, so there are 90 students in the cafeteria
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Answer:

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Step-by-step explanation:

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log_b(x)=\frac{log_a(x)}{log_a(b)}

So, for log_2(5)

log_2(5)=k=\frac{log(5)}{log(2)}\hspace{10}(1)

Now, using change of base for log_3_2(5)

log_3_2(5)=\frac{log(5)}{log(32)}

You can express 32 as:

2^5

Using reduction of power property:

log_z(x^y)=ylog_z(x)

log(32)=log(2^5)=5log(2)

Therefore:

log_3_2(5)=\frac{log(5)}{5*log(2)}=\frac{1}{5} \frac{log(5)}{log(2)}\hspace{10}(2)

As you can see the only difference between (1) and (2) is the coefficient \frac{1}{5} :

So:

\frac{log(5)}{log(2)} =k\\

log_3_2(5)=\frac{1}{5} \frac{log(5)}{log(2)} =\frac{1}{5} k

6 0
3 years ago
A bag holds 11 beads. 7 are red, the rest are white. Two beads are taken at random from the bag. What is the probability that on
babunello [35]

Answer:

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  So, if draw 1 is white, then the probability of draw 2 being red is 7/10.  and if the first draw is red, then the probability of draw two being white is 5/10.

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ikadub [295]

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Step-by-step explanation:

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8 0
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Answer:

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