Someone asked "10,900,000 (10.9 million) is 299% more than x". What's the value of x?

43 Views Asked by At

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

There are 2 best solutions below

0
On BEST ANSWER

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.

0
On

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 $x$.