Question 224287
<font face="Garamond" size="+2">


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{150}{650}\ =\ \frac{115}{x}\ \Rightarrow\ \frac{3}{13}\ =\ \frac{115}{x}]


Cross-multiply:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 3x = 13\cdot115]


Now just do the arithmetic.


By the way, it works just as well without reducing the fraction -- it is just that the numbers are bigger and uglier:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 150x = 650\cdot115]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
</font>