1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lyudmila [28]
3 years ago
15

At Harriet Tubman middle school, there are 85 students in the 7th grade . The number of girls is 1 1/2 times the number of boys.

How many girls and how many boys are in the 7th grade?
Mathematics
1 answer:
tatuchka [14]3 years ago
5 0

Answer:

Number of boys in 7th grade=34 boys

Number of girls in 7th grade=51 girls

Step-by-step explanation:

Total Number of students in 7th grade=Number of boys+Number of girls

where;

Total number of students in 7th grade=85 students

Number of boys=x

Number of girls=(1 1/2)×Number of boys=(3/2)×x=1.5x

Replacing;

85=x+1.5x

2.5x=85

x=85/2.5

x=34

Number of boys=x=34

Number of girls=1.5x=1.5×34=51

Number of boys in 7th grade=34 boys

Number of girls in 7th grade=51 girls

You might be interested in
Which of the following is a correct interpretation of the expression -4 + 13? A. the number that is 4 to the left of -13 on the
svetoff [14.1K]

Answer:

The answer is D the number that is 13 to the right of -4 on the number line.

Step-by-step explanation:

4 0
3 years ago
A bag contains 30 kg of rice A family consumed 2/3 of it how much rice is left in the bag​
polet [3.4K]

Answer:

20 kg

Step-by-step explanation:

To calculate the amount of rice left we have to find 2/3 of 30

\frac{30}{1}  \times  \frac{2}{3}  \\  \frac{60}{3} \:  = 20

4 0
2 years ago
At the Healesville supermarket,
BigorU [14]

Answer:

5.75 meters

Step-by-step explanation:

Here we are told that , the trolley added to the stack , increases the length by 25 cms or 0.25 mts.

Hence every trolley stacked will add 0.25 mts to the trolley already stacked. However the first trolley in 20 trolleys will be occupying 1 mt only. Hence , rest of the 19 trolleys will be covering 0.25×19=4.75 mts.

Hence , total distance covered by 20 trolleys =

1+4.75=5.75 mts

5 0
3 years ago
What is the independent variable. T=2h+5
likoan [24]

Answer:

H.

Step-by-step explanation:

H does not depend on a number.

5 0
3 years ago
In a network of 40 computers, 5 hold a copy of a particular file. Suppose that 7 computers at random fail. Let F denote the numb
anzhelika [568]

Answer:

a. E(F)=0.875

b. 99.9976%

c. P(X=2)=0.1683

Step-by-step explanation:

a. We notice that this is a binomial distribution with the probability of success;

p=\frac{5}{40}=0.125

#We are given the sample size, n=7. The Expected value is calculated as:

E(X)=np\\\\E(F)=np , n=7, p=0.125\\\\E(F)=7\times 0.125\\\\=0.875

Hence the expectation, E(F)=0.875

b. To calculate the probability of the range of F, we need to calculate all possible outcomes of F in the given sample;

P(X\leq 5)=1-P(X=6)-P(X=7)\\\\=1-{7\choose 6}(0.125)^6(1-0.125)^1-{7\choose 7}(0.125)^7(1-0.125)^0\\\\=1-0.000023365-0.000000476\\\\=0.999976158\\\\=99.9976\%

Hence, the range of F is 99.9976%

c. The probability that F=2 is calculated  using the binomial distribution function as:

P(X=2)={7\choose 2}(0.125)^2(1-0.125)^5\\\\=0.1683

Hence, the probability of F=2 is 0.1683

3 0
3 years ago
Other questions:
  • What's the slope of 2,3 and 9,4
    11·1 answer
  • According to the Ruler Postulate, what does the set of points on any line correspond to?
    11·1 answer
  • Is 4/12 equal to 7/28?
    6·2 answers
  • How do you find x for side bc
    13·1 answer
  • 5x+1=x+9 help please and thank you
    10·1 answer
  • HELP!!
    15·1 answer
  • There are 10 girls and 8 boys in Mr Augellis class. If 5 more girls and 5 more boys join the class, will the ratio of girls to b
    5·1 answer
  • The three angle bisectors of ΔABC intersect at point P. Point P is the
    14·2 answers
  • A cab charges $1.75 for the flat fee and $0.25 for each mile. Write and solve an inequality to determine how many miles Eddie ca
    9·2 answers
  • PLS HELP The figure shown is created by joining two rectangles. Enter the area, in square inches, of the figure.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!