Lucy bought a doormat for $7 and some placemats for $2 each. her total average cost per item was $3. create a rational equation, and determine how many placemats she bought.

Lucy bought 4 placemats.

Step-by-step explanation:

Let n be the number of placemats Lucy bought.

1 doormat = $7

1 placemat = $2

n placemats = $2n

Total = $(7+2n)

Total number of objects bought = n+1

Average

So,

Solve this equation:

Hence, Lucy bought 4 placemats.

this is a very good question

step-by-step explanation:

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