The school bookstore ordered three-ring notebooks. They put 75% of the order in the warehouse and sold 0% of the rest in the first week of school. There are 25 notebooks left in the store to sell. How many three-ring notebooks did they originally order? Show and explain your answer.

ok so x + y = n (where n is the number of the original order, x is the part that went to the store and y is the number in the warehouse.)

25 = 20% of x, so x = (25 divided by .2) = 125 notebooks went to the store.

125 = 25% of total n (because 75% went into warehouse and 100-75 = 25).

so 125 divided by .25 = 500 notebooks. total.

and (500-125 = 375 notebooks into the warehouse.)

what is

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