Question

You have 5 faceup cards and 12 facedown cards. You add some faceup cards so 2 out of every 5 cards are faceup. How many cards are there now?

How would a proportion look for this problem?

Answer 1

assuming x is additional face-up:
\[(5+x)/(12) = 2/5\]

Answer 2

Draw a proportion for me. I understand that way of doing it. But my teacher is looking for a proportion.

Answer 3

Like a ratio? solve for x, then the answer is 5+x:12

Answer 4

Example