Answer:
To make sure Mrs. Robbins has just enough peaches, she should order the same amount of peaches as the number of pies she expects to make, multiplied by the number of pounds of peaches she needs per pie, multiplied by the percentage of peaches she expects to use, since she expects to lose 15% of the peaches. Therefore, she should order 30 pies * 1 pound/pie * .85 = <<301.85=25.5>>25.5 pounds of peaches.
Explanation: