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beks73 [17]
3 years ago
10

The ratio of boys to girls in a class is 3:1. There are 36 students in the class. How many students are girls?

Mathematics
2 answers:
Viefleur [7K]3 years ago
8 0

Answer:

Given - Ratio of boys to girls is 3 : 1

Total 36 students

To find - No. of girls

Solution

Let the ratio be 3x and X

3x + X = 36

4x = 36

x = 36/4

x= 9

1x = 9

There are 9 girls in the class

Vera_Pavlovna [14]3 years ago
4 0

Answer:

9 girls

Step-by-step explanation: If u write it out like this 3:1 6:2 and onwards till the two numbers add to 36 you will get the answer of 9 this should be right sorry if it isn't

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The LCM of 2 numbers is 60 and 1 of the numbers is 7 less than the other number. What are the numbers?
Phoenix [80]
Let's represent the two numbers by x and y.  Then xy=60.  The smaller number here is x=y-7.

Then (y-7)y=60, or y^2 - 7y - 60 = 0.  Use the quadratic formula to (1) determine whether y has real values and (2) to determine those values if they are real:

discriminant = b^2 - 4ac; here the discriminant is (-7)^2 - 4(1)(-60) = 191.  Because the discriminant is positive, this equation has two real, unequal roots, which are
        -(-7) + sqrt(191)
y = -------------------------
             -2(1)

and 

        -(-7) - sqrt(191)
y = ------------------------- = 3.41 (approximately)
             -2(1)

Unfortunately, this doesn't make sense, since the LCM of two numbers is generally an integer.


Try thinking this way:  If the LCM is 60, then xy = 60.  What would happen if x=5 and y=12?  Is xy = 60?  Yes.  Is 5 seven less than 12?  Yes.






5 0
3 years ago
Help i will give brainest
masha68 [24]

Answer:

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3 0
3 years ago
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Write an equation to represent m varies inversely as the square of q ?​
kolezko [41]

Answer:

m = \frac{k}{q^2}

Step-by-step explanation:

Given m varies inversely as q² then the equation relating them is

m = \frac{k}{q^2} ← k is the constant of variation

4 0
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The screening process for detecting a rare disease is not perfect. Researchers have developed a blood test that is considered fa
lesya692 [45]

Answer:

Type I: 1.9%, Type II: 1.6%

Step-by-step explanation:

given null hypothesis

H0=the individual has not taken steroids.

type 1 error-falsely rejecting the null hypothesis

⇒   actually the null hypothesis is true⇒the individual has not taken steroids.

 but we rejected it ⇒our prediction is the individual has taken steroids.

typr II error- not rejecting null hypothesis when it has to be rejected

⇒actually null hypothesis is false ⇒the individual has taken steroids.

but we didnt reject⇒the individual has not taken steroids.

let us denote

the individual has taken steroids by 1

the individual has not  taken steroids.by 0

                            predicted

                              1       0

   actual          1    98.4%  1.6%

                        0   1.9%   98.1%

so for type 1 error  

 actual-0

predicted-1

therefore from above table we can see that probability of Type I error is 1.9%=0.019

so for type II error

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predicted-0

therefore from above table we can see that probability of Type I error is 1.6%=0.016

5 0
3 years ago
I need help ASAP?!!!!
Roman55 [17]

Answer:

B. 1 3/8

or

The second one

Step-by-step explanation:

4 1/8 ÷ 3 = 1.375 = 1 3/8

hope this helps

have a good day

6 0
2 years ago
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