GRE Exam Numerical Ability Algebra

If a, b, c, and d are consecutive integers such that a

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If a, b, c, and d are consecutive integers such that a
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GRE Other Question

Three solid cubes of lead, each with edges 10 centimeters long, are melted together in a level, rectangular-shaped pan. The base of the pan has inside dimensions of 20 centimeters by 30 centimeters, and the pan is 15 centimeters deep. If the volume of the solid lead is approximately the same as the volume of the molted lead, approximately how many centimeters
deep is the melted lead in the pan? What is the cost, in cents, of using a certain fax machine to send n pages of a report if the total cost for sending the first k pagers is r cents and the cost for sending each additional page is s cents? (Assume that n > k.)
(A) r + s (n - k) (B) r + s (n + k) (C) rs(n + k)
(D) kr + s(n - k) (E) kr + ns