The cost of purchasing and mailing party invitations is $2.75. If the cards are purchased at 3 for 10 cents and each requires a 5 cents stamp, how many cards were purchased?

Question

imstuck · Answer

You need equations here.  Let's find them so we can find the number of cards that were purchased.

imstuck · Answer

Give me a sec to work this out and I'll post in a minute, ok?

anonymous · Answer

Is the equation "0.03x+0.05= 2.75"?

imstuck · Answer

Well, not quite, but close.  That .05 you have there has to be multiplied by the number of cards you have, because it costs 5 cents per card.  The way you have it, you are only paying 5 cents to mail them all.

imstuck · Answer

Ok, here it is:

anonymous · Answer

Is the answer 18 ?

imstuck · Answer

|dw:1410571132985:dw|