Follow the steps of the Systematic Approach of Section 14.4—that is, (1) identify the system, (2) determine whether the process is batch or rate, (3) construct a schematic diagram with inputs and outputs, (4) Label known material quantities or rates of flow and so on. A road construction firm has a leftover mix of stones from a previous job. The mix consists of 37.5 percent of stones (by mass) between 16 and 25 mm in diameter and 26.8 percent between 10 and 15 mm with the remainder under 10 mm. A new mix is needed that does not require any stones less than 10 mm. These will be screened out and stones between 16 and 25 mm added such that the final mixture contains 74.6 percent of the largest size and has a mass of 46.8 t. How much of the first mix is needed?

Question

What will be an ideal response?

Answer 1