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Anna [14]
3 years ago
7

At a school there are 864 students and 80 staff members. 5/8 of the students are boys. How many girls are in the school?

Mathematics
2 answers:
alexgriva [62]3 years ago
7 0

Answer:

354

Step-by-step explanation:

3/8 multiplied by 864

Phoenix [80]3 years ago
3 0

Answer: 324 girls

864 divided by 8 = 108

108 x 5 = 540

864 - 540 = 324

Step-by-step explanation:

80 staff members is irrelevant.

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Original price:$30; markdown:33%
Travka [436]
30 x 0.33 = 9.90 And that's the answer
3 0
3 years ago
Initially, there are 40 grams of A and 50 grams of B, and for each gram of B, 2 grams of A is used. It is observed that 15 grams
hram777 [196]

Answer:

X(16)=25.71grams

Step-by-step explanation:

let X(t) denote grams of C formed in  t mins.

For X grams of C we have:

\frac{2}{3}Xg of A and \frac{1}{3}Xg of B

Amounts of A,B remaining at any given time is expressed as:

40-\frac{2}{3}Xg of A and  50-\frac{1}{3}Xg  of B

Rate at which C is formed satisfies:

\frac{dX}{dt} \infty(40-\frac{2}{3}X)(50-\frac{1}{3}X)->\frac{dX}{dt}=k(90-X)\\\therefore \frac{dX}{(90-X)^2}=kdt->\int{\frac{dX}{(90-X)^2}} \, =\int {k} \, dt  \\\therefore \frac{1}{90-X}=kt+c->90-X=\frac{1}{kt+c}\\\\X(t)=90-\frac{1}{kt+c}

Apply the initial condition,X(0)=0 ,to the expression above

0=90-\frac{1}{c} \ \ ->c=\frac{1}{90}\\\therefore\\X(t)=90-\frac{1}{kt+\frac{1}{90}} \ \ ->X(t)=90-\frac{90}{90kt+c}

Now at X(8)=15:

15=90-\frac{90}{90\times 8k+1}  \ ->75=\frac{90}{720k+1}\\k=0.0002778

Substitute  in X(t) to get

X(t)=90-\frac{90}{0.0002778t\times 90+1}\\X(t)=90-\frac{90}{0.25t+1}\\But \ t=16\\\therefore X(t)=90-\frac{90}{0.025\times16+1}\\X(t)=25.71

5 0
2 years ago
If a side of the field is 9/10 mile and 1/2 mile what is the length of the field
Katyanochek1 [597]

Answer:

<em>The field is 1 and 4/10 mile long.</em>

Step-by-step explanation:

If I understand the question:

(1/2) + (9/10) =

(5/10) + (9/10) = (14/10)

(14/10) is 1 and 4/10

The field is 1 and 4/10 mile long.

4 0
2 years ago
Someone plz help me giving brainliest
Nonamiya [84]
I think the answer is 6
6 0
3 years ago
A and b share the cost in a ratio of 3:2. the cost is £85 how much does A pay?
Rufina [12.5K]
A pays 3/5 x 85 = £51,-
b pays 2/5 x 85= £34,-
So the answer is £51,-
8 0
3 years ago
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