What is 4/5 of 1/4 of 40

Mathematics

2 answers:

PilotLPTM [1.2K]3 years ago

5 0

Answer:

Step-by-step explanation:

That translates into (4/5)(1/4)(40).

Simplifying, from right to left: (4/5)(10) => 8

guapka [62]3 years ago

5 0

There are three steps to this problem.

1. First, you'll need to find out what 1/4 of 40 is. An easy way to determine this is by simply dividing 40 by 1/4. (This will only work if you have to divide a fraction with a numerator of 1 by a whole number, though.) You'll end up with 10.

2. Then, you will have to determine what 4/5 of 10 is. You can't divide a number by a fraction, so you will have to multiply 10 by 4/5 instead. The picture shown is how you'll set it up.

3. Now you'll need to simply 40/5, to do this, you can simply divide 40 by 5.

Your answer will end up being 8.

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How much will be left after 24 hrs if it’s half life is 6 hours?

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3 0

3 years ago

The table shows the results of a poll of 200 randomly selected juniors and seniors who were asked if they attended prom. Find th

Zielflug [23.3K]

Answer:

(a) $\frac{7}{25}$

(b) $\frac{19}{116}$

Step-by-step explanation:

Number of juniors who attended prom,n(J)=28

Number of seniors who attended prom,n(S)=97

Total of those who attended prom=125

Number of juniors who did not attend prom,n(J')=56

Number of seniors who did not attend prom,n(S')=19

Total of those who attended prom=75
Total Number of students=200

(a) P (a junior who did not attend prom)

$P(J')=\frac{56}{200}= \frac{7}{25}$

(b)

$P(Senior)=\frac{116}{200}$

$P ($did not attend prom$ | senior)=\frac{\text{P(seniors who did not attend prom)}}{P(Senior)} \\=\frac{19/200}{116/200} \\=\frac{19}{116}$

(c)P (junior | attended prom)

$P(Senior)=\frac{84}{200}$

$P (Junior|$ attended prom$)=\frac{\text{P(juniors who attended prom)}}{P(\text{those who attended prom)}} \\=\frac{28/200}{125/200} \\=\frac{28}{125}$