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4 years ago

I spent 3/4 of my money and then I spent 1/5 of what was left.

Mathematics

1 answer:

Monica [59]4 years ago

6 0

Answers:

a) 4/5

b) 1/5

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Let's say you start off with $100. If you spend 3/4 of that, then you spend 75 dollars (because 75/100 = 3/4). Think of it like 75 cents = 3 quarters. If you spend 75 dollars out of 100 total, then you have 100-75 = 25 dollars left after the first round of spending.

If you spend 1/5th of what is left, then you spend $5 on the second round leaving 25-5 = 20 dollars left at the end of the day.

Total up what you spend for both rounds: 75+5 = 80, which divides over the original amount 100 to get 80/100 = 8/10 = 4/5

If you had 20 dollars at he end of the day, out of 100 initially, then 20/100 = 2/10 = 1/5 is the fraction of what you have left.

note how 4/5 and 1/5 add to 5/5 = 1.00 = 100%. This is because the amount you spend and the amount you have left over must add to 100% of all the money you started with

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<h3>What is the formula for P(AUB), where A and B are any two events?</h3>

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Given that 42% of the students participate in sports and 25% of the students participate in drama and 53% of the students participate in either sports or drama.

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By the above formula, we obtain:

$P(S\cup D)=P(S)+P(D)-P(S\cap D)\\\Longrightarrow P(S\cap D)=P(S)+P(D)-P(S\cup D)\\\Longrightarrow P(S\cap D)=0.42+0.25-0.53\\\therefore P(S\cap D)=0.14=\frac{14}{100}$

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To learn more about probability, refer: brainly.com/question/24756209

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Read 2 more answers

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this is how i got it:

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