Finishing Maths: Supplied Two-Part Mixing Ratios and Pot Life

Finishing Maths: Supplied Two-Part Mixing Ratios and Pot Life

Original quantitative topic practice in English. All 24 questions are included in a shuffled order. Each question supplies its own data and model assumptions; use only those assumptions. Choose one answer. Practice target: 20/24, not an official examination pass mark. Keep full intermediate precision. These exercises cover the calculation scope in the title; they do not constitute a full Red Seal examination, trade qualification, site design or operating specification.
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A supplied hypothetical coating sheet specifies a 4:1 mixing ratio BY MASS for A:B. Prepare 1500 g mixed material per batch; do not add thinner. A session needs 6200 g and a partial final batch is permitted. A batch is mixed at minute 15; its stated working period is 45 minutes from mixing. This is arithmetic with supplied data, not a product recommendation. Calculate the batches needed including the final partial batch. Keep intermediate values unrounded; round the final answer to 4 decimal places if needed.