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White raven [17]
3 years ago
11

In 20 years Mark will be three times as old as he was 10 years ago how old is he

Mathematics
1 answer:
Marizza181 [45]3 years ago
3 0

Answer:

Age of Mark is 25 years.

Step-by-step explanation:

Let the current age of Mark = x years

After 20 years, age of Mark=(x+20) years

10 years ago,age of Mark was (x-10) years.

In 20 years Mark will be three times as old as he was 10 years ago.

=> \[(x+20) = 3*(x-10)\]

=> \[(x+20) = 3x-30\]

=> \[(3x-x) = 30+20\]

=> \[(2x) = 50\]

=> \[x = \frac{50}{2}\]

=> \[x = 25\]

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Answer:

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Step-by-step explanation:

All three of these ratios are equivalent to 15:5. Here's how:

Let's look at the first ratio, 9:3. Did you notice something common? 3 x 3 = 9. 9/3 = 3. 5 x 3 = 15. 15/3 = 5. Both of these numbers are divisible by 3,  so these ratios are equivalent.

Second. 6:2. 2 x 3 = 6. 6/3 = 2. 5 x 3 = 15. 15/3 = 5. See the similarity? The same applies to the next problem, number three, although it does slightly differentiate.

Third, 3:1. See, here, since the ratio is smaller than the problem, we can't multiply, since this ratio is smaller than the original number. But, it's still the same thing. A ratio is a number that compares a value to another value. This means that 3:1 is 3 compared to one. Now, let me clarify. 15:5. 3:1. These are the exact same values, except they are just written in a different form, and simplified. Since 5 x 3 = 15, we know that we can divide 15 evenly by 5, which makes it 3, and divide 5 evenly by 5, which equals one. So here we have our answer for the third problem. 5:1.

Ratios are basically division, except simplified. Every single ratio problem works this way. Once you get the hang of it, it's immensely easy. Hope this helped!

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