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3 years ago

In a class there are 20 boys and 15 girls.The ratio of boys to girls is

Mathematics

2 answers:

BigorU [14]3 years ago

6 0

Answer:

can u explain more and if not i thnk it is 20:15

Step-by-step explanation:

ser-zykov [4K]3 years ago

5 0

Answer:

number of boys in the class = 20

number of girls in the class = 15

ratio of girls is to boys(Percentage) = 15/20 x 100

= 0.75 x 100 = 75%

Step-by-step explanation:

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An empty box weighs 200g The box is filled with birthday party goody bags and it now weighs 6.2kg Each goody bag weighs 150g Wor

leva [86]

Answer:

The answer to your question is: 40 bags

Step-by-step explanation:

Data:

box weight = 200 g

Box weight + bags = 6.2 kg

1 bad weight = 150 g

Process:

We need to know the weight of all the bags so we subtract the box weight from the total weight

Goody bags weight = 6200 g - 200 g

Goody bags weight = 6000 g

To find the weight of one bag we use a rule of three

1 goody bags ---------------- 150 g

x ---------------- 6000 g

x = (6000) (1) / 150 = 40 bags

5 0

3 years ago

Which graph represents the equation y = x2 + 1?

____ [38]

Answer:

im pretty sure its the last image.

Step-by-step explanation:

5 0

3 years ago

Please help me solve this..

Nataliya [291]

Answer:

Step-by-step explanation:

Let a = number of pieces of chocolate bought by Amin.

Let b = number of pieces of chocolate bought by Bob.

b = 2a

(a - 3)(b - 3) = 14

ab - 3a - 3b + 9 = 14

a(2a) - 3a - 3(2a) = 5

2a^2 - 3a - 6a = 5

2a^2 - 9a - 5 = 0

(2a + 1)(a - 5) = 0

2a + 1 = 0 or a - 5 = 0

a = -1/2 or a = 5

Amin cannot have bought -1/2 pieces of chocolate, so we discard the soluion a = -1/2.

a = 5

Answer: 5

3 0

2 years ago

Read 2 more answers

A circle has a radius of 6 cm. What is the area of the circle? (Use 3.14 for pi)

vampirchik [111]

Answer:

113.04 cm²

Step-by-step explanation:

area of a circle= πr²

= 3.14 x 6²

=3.14 x 36

= 113.04 cm²

5 0

3 years ago

At an ocean-side nuclear power plant, seawater is used as part of the cooling system. This raises the temperature of the water t

grandymaker [24]

Answer:

(a1) The probability that temperature increase will be less than 20°C is 0.667.

(a2) The probability that temperature increase will be between 20°C and 22°C is 0.133.

(b) The probability that at any point of time the temperature increase is potentially dangerous is 0.467.

Step-by-step explanation:

Let X = temperature increase.

The random variable X follows a continuous Uniform distribution, distributed over the range [10°C, 25°C].

The probability density function of X is:

$f(X)=\left \{ {{\frac{1}{25-10}=\frac{1}{15};\ x\in [10, 25]} \atop {0;\ otherwise}} \right.$

(a1)

Compute the probability that temperature increase will be less than 20°C as follows:

$P(X$

Thus, the probability that temperature increase will be less than 20°C is 0.667.

(a2)

Compute the probability that temperature increase will be between 20°C and 22°C as follows:

$P(20$

Thus, the probability that temperature increase will be between 20°C and 22°C is 0.133.

(b)

Compute the probability that at any point of time the temperature increase is potentially dangerous as follows:

$P(X>18)=\int\limits^{25}_{18}{\frac{1}{15}}\, dx\\=\frac{1}{15}\int\limits^{25}_{18}{dx}\,\\=\frac{1}{15}[x]^{25}_{18}=\frac{1}{15}[25-18]=\frac{7}{15}\\=0.467$

Thus, the probability that at any point of time the temperature increase is potentially dangerous is 0.467.

(c)

Compute the expected value of the uniform random variable X as follows:

$E(X)=\frac{1}{2}[10+25]=\frac{35}{2}=17.5$

Thus, the expected value of the temperature increase is 17.5°C.

7 0

3 years ago