To answer this question, we would have to use algebra.

Let the unknown number be A.

Now, as per the question, we have the equation ->
2A - 7 > 5 + A
==> 2A - A > 5+7
==> A > 12

So, the final answer is --> A > 12

4 0

3 years ago

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The probability of having a winning raffle ticket is 20%. If you bought 50 tickets, how many winning tickets should you expect t

Usimov [2.4K]

$\frac{20}{100} = \frac{x}{50}$
Let's solve for x:
100x=1000
Divide by 100
x=10
You should expect to win 10 times.

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3 years ago

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A shipping container contains seven complex electronic systems. Unknown to the purchaser, two are defective. Two of the seven ar

kodGreya [7K]

Answer:

$\large\boxed{\large\boxed{10/21}}$

Explanation:

There are only two mutually exclusive possibilities for each complex electronic system: being defective or being not defective:

Number of complex electronic systems: 7
Nmber of defective systems: 2
Number of not defective systems: 5

Probability that no defective systems are found in the sample is the equal to the probability of selecting them consecutively without replacement and finding each one is not defective:

Porbability the first is not defective × probability the second is not defective

5/7 × 4/6 = 20/42 = 10/21

4 0

3 years ago