Be the First to Solve this Math Test and Win an 100% upvote worth $0.4 Instantly #13 by steemitcentral

maths · @steemitcentral · Aug 5 '18 (edited)

$1.57

Be the First to Solve this Math Test and Win an 100% upvote worth $0.4 Instantly #13

Okay. Let's get started. The first person to solve the word problem below will get an upvote worth $0.4. There will also be some consolation upvotes for some of the late comers.
<center>![2grekv.gif](https://cdn.steemitimages.com/DQmdrA7GccgPzLhAzXknuR1UhBwooucK9Jr44BxXkZdwHJD/2grekv.gif)</center>

---


### <center>How To Participate:</center>
Kindly **UPVOTE** this post and then answer the question which follows in the comment section. **Entries that do not comply with this simple rule will be disregarded.**

### <center>Question:</center>
 

In January of the year 2000, I was one more than eleven times as old as my son William. In January of 2009, I was seven more than three times as old as him. How old was my son in January of 2000?

---
### <center>Deadline</center>
The test comes to an end once a winner emerges or at the expiration of this post. Good luck guys. 

---

## <center>Thanks for visiting this channel @steemitcentral. Use the "steemitcentral" tag in your Steemit or crypto-related posts and get rewarded with some upvotes.</center>
![IMG-20180606-WA0005.jpg](https://cdn.steemitimages.com/DQmUx3XBcnUNMAJ8yk3Dxm7mW8TgbWRnxzq3X2RxjHyayJU/IMG-20180606-WA0005.jpg)

👍 ausbitbank, steemitcentral, majes.tytyty, gandhibaba, artzanolino, steemph, walkofhope, bearone, luvabi, immarojas, prince121, divinekids, steemitph, webcoop, dandalion, rye05, steemph.antipolo, steemph.uae, arrliinn, ruah, enjieneer, steemph.bulacan, toffer, julstamban, steemph.manila, steemph.davao, eastmael, romeskie, elisaulp, bobiecayao, markjason, riderblack, pingcess, juancmz, probablysane, florino, lerma, appleskie, annazsarinacruz, tamaxadi, josephace135, cradle, steemph.negros, ahna8911, pepperpotts, blessedsteemer, dwin0603, acinad, steemph.trail, steemnest, twotripleow, the-gate-keeper, sheshebaylosis, littlesteemitph, dandalioncub, johnpd, michealkey, lifediaries2nd, sushiemu, prinsepong, akosimalai, ajake21, likhang-filipino, pearly, and 4 others

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@probablysane · Aug 5 '18

Going to say your son was 3 years old 😀

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@prince121 · Aug 5 '18

Ans: 3 years old

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@florino · Aug 5 '18 (edited)

$0.35

Answers : 3
Cos your son was 3 years old in January of 2000

👍 steemitcentral, florino

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@juancmz · Aug 6 '18

$0.12

Ok, we can consider William's age as an ![](https://cdn.steemitimages.com/DQmPkiHczcf6313hppZueLy5BKupCByqukrKLbx6uVvGBC2/blob), and the age of the father as ![](https://cdn.steemitimages.com/DQmRmXVC1yy2GvMv5BUA9MDNPTZKfcx3nTbLBsMNJ4oFbSQ/blob), then taking into account the data of the problem, we expreed it mathematically as:

![](https://cdn.steemitimages.com/DQmZhNfA3pR32Faq6JWsDbchYBb5pFW6ZpLKvM1dTvkLWnT/blob)

It is understood then that we have an equation system with two unknowns, of which we want to know the value of X, so to solve it we will use the Crámer rule for [determinant](https://steemit.com/spanish/@juancmz/determinantes-para-resolver-sistemas-de-ecuaciones-lineales-de-primer-orden) (Spanish version). We proceed to rewrite the system and identify the **coefficients**:

![](https://cdn.steemitimages.com/DQmWpjVbSjsm8zCqxziAJYzy1qKPARdpNNeJ18RXPMnRq34/blob)

For x, by the method of determinate we have:

![](https://cdn.steemitimages.com/DQmau58h5FxDdGkUMwpfXRGmWkXrp6g6uMWnzBw6BH8rT67/blob)


![](https://cdn.steemitimages.com/DQmUHqMwrHYhtfffJHJnh7u22vvBiZNNopyAeHPBHEyoVnJ/blob)

solved with pleasure by @juancmz

👍 steemitcentral, juancmz

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@elisaulp · Aug 6 '18

3 years

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@johnpd · Aug 7 '18

the answer is 3yrs old

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@steemph.trail · Aug 10 '18 (edited)

$0.09

<center>
![trail.png](https://cdn.steemitimages.com/DQmaCcr2dYj567HJQ2kdDPb5Q96nVs219Lzxhi4iUArzmN8/trail.png)

See your post featured [here](https://steemit.com/steemph/@steemph/community-competitions-tuesday-with-steemph-2149974465508) by @romeskie on *Community Competitions Tuesday*, a community curation initiative by @SteemPh.

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</center>

👍 steemitcentral

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