Question 972994
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Let *[tex \Large x] represent the number of ducks.  Then *[tex \Large 3x] is the number of chickens.  *[tex \Large 10x] is the value of the ducks and *[tex \Large 18x] is the value of the chickens.  And...


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 10x\ +\ 18x\ =\ 420]


Solve for *[tex \Large x], then multiply by 3.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \