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Someone in the office asked this question, and we are attempting to solve it (it seems to be a friendly brain teaser around the work place).

We tried to do a more consumable method where the values weren't scary high.

We tried saying 5 is 50% more of x.

Our equation would be 5 / 0.5 = 10

If we follow that style of equation, then

10,900,000 / 2.99 = 3,645,484.949832775919732

Is 3,645,484.949832775919732 correct?

If not, can someone walk us through the answer?

2 Answers2

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To say that "$y$ is $a\%$ more than $x$" means that "$y$ equals $x$ plus $a\%$ of $x$". That is,

$$y = x + \left( \dfrac a{100} \right) x$$.

Thus if $5$ is $50\%$ more than $x$, then $$5 = x + \left( \dfrac {50}{100} \right) x = \dfrac 32 x$$ so that $x = \dfrac {10}3$.

You need to solve $$10900000 = x + \left( \dfrac{299}{100} \right)x = \dfrac{399}{100}x$$ for $x$.

Umberto P.
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No, it's incorrect. You have to divide by $3.99$ not $2.99$. You would be correct if the question said, "$10,000,000$ is $299\%$ of $x$," instead of $299\%$ more than $x$. Just as $100\%$ more means twice as much, $300\%$ more means $4$ times as much, and this is a just a tad less.

Generally "$p$ percent more" means as much, plus another $p$ percent.

saulspatz
  • 53,131