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11beehshahbazThere are two types of notebooks which Ben bought. One type cost $ 3.50 each and the other type cost $4.25 each. The number of least expensive notebooks is x. This means Ben bought x notebooks of $ 3.50 each. Since he bought 7 notebooks in total, the number of other notebooks will be (7 - x) The price of 7 notebooks was $34.50. So we can set up the equation as follows: 3.50x + 4.25(7 - x) = 34.50 Using this equation we can find the value of x i.e. the number of least expensive notebooks purchased.

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joccalubGiven:Total Price of 7 notebooks ben bought = $34.50 If X= number of least expensive notebook at $3.50, then 7-X=number of the other notebook at $4.25The equation to find X will be:X(3.50)+(7-X)4.25=34.50