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Elena-2011 [213]
3 years ago
11

The ratio of boys to girls in a group is 3:1. If there are 28 more boys than girls, work out how many people there are in total.

Mathematics
1 answer:
Ber [7]3 years ago
7 0
---------------------------------------------------
Ratio 
---------------------------------------------------
Boys : Girls : Total
  3     :   1         4

---------------------------------------------------
Difference in shares :
---------------------------------------------------
Difference in shares = 3 - 1 = 2

---------------------------------------------------
Find 1 share :
---------------------------------------------------
2 shares = 28
1 share = 28 ÷ 2 = 14

---------------------------------------------------
Find 4 shares (Total) :
---------------------------------------------------
1 share  = 14
4 shares = 14 x 4 = 56

---------------------------------------------------
Answer: There are 56 people in total.
---------------------------------------------------

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Answer:

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Step 1: Remove the parentheses (5r-10= -51)

Step 2: Move the constant to the right-hand side and change the sign (5r= -51 + 50)

Step 3: Calculate the sum of -51 +50 (5r = -1)

Last Step: Divide both sides by the equation by 5 (r = -1/5)

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Step-by-step explanation:

Given

Stacy ran \frac{9}{12} of a km i.e.

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Jules ran \frac{4}{5} of a km i.e.

\Rightarrow 1\times \dfrac{4}{5}=0.8\ km

Raul ran \frac{3}{4} of mile i.e.

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Shkiper50 [21]

Answer:

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Step-by-step explanation:

We can model this problem with a Poisson distribution, with parameter:

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a) The mean amount of cases is equal to the parameter λ=0.14608.

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c) The probability of more than one case is:

P(k>1)=1-P(k\leq 1)=1-0.990=0.010

d) The cluster of 4 cases can not be due to pure chance, as it is a very high proportion of cases according to the average rate. Just having more than one case has a probability of 1%.

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Step-by-step explanation:

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