A collection of 20 coins, each with a face value of either 10 cents or 35 cents, has a total face value of $2.5. How many of the coins have a face value of 35 cents?	Choose the correct choice from the following
A) 2	B) 4	C) 6	D) 8	E) 7
0.10(x)+0.35(20-x)=2.5   0.10x+7-0.35x=2.5   so x=18   20-x=2   ans is 2
<result>A</result>
A collection of 20 coins, each with a face value of either 10 cents or 35 cents, has a total face value of $2.5. How many of the coins have a face value of 35 cents?