don has 18 coins. some are quarters and some are dimes. the total value of the coins is $3.45. How many of each type of coin does he have? Be sure to identify your variables

Question

anonymous · Answer

$$25x+(10(18-x)=345$$ solve for x

anonymous · Answer

typo on first parentheses

watchmath · Answer

Let $x,y$ be the number of quarters and dimes respectively.
Then $x+y=18$ and $25x+10y=345$(cents)
Mltiply the first by -25 and add it to the second equation we have
$-15y=-105$. So $y=7$. Plug in to the first equation $x+7=11$. So $x=11$

anonymous · Answer

wouldn't i do .25x+.10y=3.45

watchmath · Answer

typo $x+7=18$ so $x=11$

anonymous · Answer

i would not use two variables when one can do, but this is a matter of preference

watchmath · Answer

what is this blue little circle means satellite?

anonymous · Answer

dunno this is all new to me

anonymous · Answer

i think they should give amistre his own special hypersphere

anonymous · Answer

i feel BAD FOR U POLLOCK DONT HELP HES JUST MEAN