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3 years ago

two-fifth of the students in a mixed school are boys. if there are 30 girl in the school how many are boys

Mathematics

2 answers:

lilavasa [31]3 years ago

6 0

12. 1/5 of 30 = 6. 6 x 2 = 12

nekit [7.7K]3 years ago

5 0

Answer:

Step-by-step explanation:

One fifth of 30 would mean u divide 30 by 5 which equals 6. Since it's two fifths you would have 12.

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In a certain Algebra 2 class of 29 students, 7 of them play basketball and 24 of them play baseball. There are 3 students who pl

antiseptic1488 [7]

Answer:

$\frac{5}{29}$

Step-by-step explanation:

Let $n(A)$ represent students playing basketball, $n(B)$ represent students playing baseball.

Then, $n(A)=7$ , $n(B)=24$

Let $n(S)$ be the total number of students. So, $n(S)=29$ .

Now,

$P(A)=\frac{n(A)}{n(S)}=\frac{7}{29}$

$P(B)=\frac{n(B)}{n(S)}=\frac{24}{29}$

3 students play neither of the sport. So, students playing either of the two sports is given as:

$n(A\cup B)=n(S)-3\\n(A\cup B)=29-3=26$

∴ $P(A\cup B)=\frac{n(A\cup B)}{n(S)}=\frac{26}{29}$

From the probability addition theorem,

$P(A\cup B)=P(A)+P(B)-P(A\cap B)$

Where, $P(A\cap B)$ is the probability that a student chosen randomly from the class plays both basketball and baseball.

Plug in all the values and solve for $P(A\cap B)$ . This gives,

$\frac{26}{29}=\frac{7}{29}+\frac{24}{29}+P(A\cap B)\\\\\frac{26}{29}=\frac{7+24}{29}+P(A\cap B)\\\\\frac{26}{29}=\frac{31}{29}+P(A\cap B)\\\\P(A\cap B=\frac{31}{29}-\frac{26}{29}\\\\P(A\cap B=\frac{31-26}{29}=\frac{5}{29}$

Therefore, the probability that a student chosen randomly from the class plays both basketball and baseball is $\frac{5}{29}$

6 0

3 years ago

How to write 60 as a product of prime factors

SVEN [57.7K]

60
30 *2
15 * 2 * 2
5 * 3 * 2 * 2

6 0

3 years ago

4 divided by 68 with remander

Studentka2010 [4]

Answer:

4÷68=1/17 is correct answer

7 0

3 years ago

Read 2 more answers

Sara is reading a 280-page book. If

fenix001 [56]

Answer:

129 - 280 = 51.. So the answer is 51%

7 0

3 years ago

Make m the subject of the equation<br> (a) 5(m + y) = 4(m - 3y)

castortr0y [4]

Answer:

m=(-5y-3y)

Step-by-step explanation:

5m+5y=4m-3y

5m-4m=-5y-3y

m(5-4)=-5y-3y

m=(-5y-3y)/1

7 0

2 years ago

two-fifth of the students in a mixed school are boys. if there are 30 girl in the school how many are boys​

two-fifth of the students in a mixed school are boys. if there are 30 girl in the school how many are boys