# Math Help - Currency Conversion Question

1. ## Currency Conversion Question

Hi all,

I thought this was a basic question, but can not get the right answer.

Ive ended up going around in circles to the point where my logic is all fuzzy so hopefully someone here can help.

So im given this chart:

If you had 120 dollars and 322 euro, how many Yen could you buy?

I tried this:

Using the 'Ringit' currency ive assumed:

3.25 dollars = 0.03Yen
5.08 euro = 0.03Yen

Purchased Yen for Dollars = (120/3.25) x 0.03 = 1.108
Purchased Yen for Euros = (322/5.08) x 0.03 = 1.902

Total Yen purchasable = 1.108 + 1.902 = 3.01

However the correct answer is 67, 574 - miles from my attempt.

Where am i going wrong?

Thanks

2. Originally Posted by jack2010
Hi all,

I thought this was a basic question, but can not get the right answer.

Ive ended up going around in circles to the point where my logic is all fuzzy so hopefully someone here can help.

So im given this chart:

If you had 120 dollars and 322 euro, how many Yen could you buy?

I tried this:

Using the 'Ringit' currency ive assumed:

3.25 dollars = 0.03Yen
5.08 euro = 0.03Yen

Purchased Yen for Dollars = (120/3.25) x 0.03 = 1.108
Purchased Yen for Euros = (322/5.08) x 0.03 = 1.902

Total Yen purchasable = 1.108 + 1.902 = 3.01

However the correct answer is 67, 574 - miles from my attempt.

Where am i going wrong?

Thanks
Convert all the given sums into Rupees and afterwards into Yen:

$\120+322E = \dfrac{\120 \cdot 42.275 \frac{R}{\}+322 E \cdot 66.09 \frac{R}{E}}{0.39\frac{R}{Y}}$ which will yield exactly the given result.

(The E means €. Unfortunatly the LaTex doesn't take this specific keyboard code)

3. Wow, my logic really had taken a day off!

Many thanks for that Earboth, makes complete sense.

Ive got plenty more where that came from so no doubt will be back in the near future!

Thanks again.

Jack

4. Originally Posted by earboth
Convert all the given sums into Rupees and afterwards into Yen:

$\120+322E = \dfrac{\120 \cdot 42.275 \frac{R}{\}+322 E \cdot 66.09 \frac{R}{E}}{0.39\frac{R}{Y}}$ which will yield exactly the given result.

(The E means €. Unfortunatly the LaTex doesn't take this specific keyboard code)
I must be completely dumb, I still don't get this at all. I also get the 3.007 every time. Could you break down the workings to your equation and really spell out what happens so I can see how the 67574 is reached. I must have spent nearly 1 hour trying to get this right. Really appreciate your help many thanks

5. Originally Posted by wil335
I must be completely dumb, I still don't get this at all. I also get the 3.007 every time. Could you break down the workings to your equation and really spell out what happens so I can see how the 67574 is reached. I must have spent nearly 1 hour trying to get this right. Really appreciate your help many thanks
I am very interested to learn how you calculated the Yen value. Please publish your calculations so we can have a look at them - and maybe we are able to show you if and where you've made a mistake.