Draw a model to represent the problem 6/12 divided by 1/4

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76