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5730Splitting Eight Units with Three JugsYou have three unmarked jugs with capacities 8, 5, and 3 units. The 8-unit jug starts completely full and the other two are empty; there is no other water source and no drain (water may only be poured between jugs). A pour transfers from one jug to another until the source is empty or the destination is full, and counts as one operation. What is the minimum number of pours needed to end with exactly 4 units in the 8-jug and 4 units in the 5-jug?脑筋急转弯困难brainteaser未尝试面试订阅5731Paying with a Gold ChainA traveler must pay an innkeeper one gold link per day for seven days, using a chain of 7 identical links. The innkeeper insists on holding exactly the right number of links each day, but is willing to give change from links already paid (so the traveler can hand over a larger piece and take back smaller ones). The traveler may cut some links open to break the chain into pieces. What is the minimum number of links that must be cut so that a correct payment can be made every day for all seven days?脑筋急转弯困难brainteaser未尝试面试订阅5732Scheduling Jobs Before Their DeadlinesFive jobs each take exactly one hour of machine time on a single machine, which can run one job per hour starting at hour 1. Each job earns its profit only if it is completed by its deadline (the hour by which it must finish); a job finished after its deadline, or not run at all, earns nothing. The jobs are: A (deadline 2, profit 100), B (deadline 1, profit 19), C (deadline 2, profit 27), D (deadline 1, profit 25), E (deadline 3, profit 15). You choose which jobs to run and in what order. What is the maximum total profit obtainable?脑筋急转弯困难brainteaser未尝试面试订阅5733Minimum Boats to Carry EveryoneFive people weighing 50, 50, 70, 80, and 90 kilograms must cross a lake. Each boat can carry at most two people and at most 140 kilograms total. Assume you have as many boats as you like, all departing together, so you only care about how many boats are required (not return trips). What is the minimum number of boats needed so that everyone can cross?脑筋急转弯中等brainteaser未尝试免费5734Squaring Near a Round BaseCompute 98 squared in your head using the nearest round hundred.脑筋急转弯简单数值题未尝试免费5735Product of Two Numbers Around a MidpointMultiply 53 by 47 mentally by exploiting their common midpoint.脑筋急转弯简单数值题未尝试免费5736Sub-One-Percent of a Large NotionalWhat is 0.35% of 4,400,000?脑筋急转弯中等数值题未尝试免费5737Doubling Time by Rule of 72An investment compounds at 8% per year. Using the rule of 72, roughly how many years does it take to double?脑筋急转弯简单数值题未尝试免费5738Eighths to DecimalConvert the fraction 7/8 to a decimal in your head.脑筋急转弯简单数值题未尝试免费5739Compound Versus Simple Interest Gap1,000,000 earns 5% per year for 2 years. How much more does compound interest yield than simple interest over the two years?脑筋急转弯中等数值题未尝试免费5740Basis Points to DollarsA spread of 35 basis points is charged on a notional of 8,000,000. What is the dollar amount?脑筋急转弯简单数值题未尝试免费5741Reciprocal of a Small DecimalEstimate 1 divided by 0.016 mentally.脑筋急转弯中等数值题未尝试免费5742Blended Portfolio YieldA portfolio holds 60% of its value in an asset yielding 4% and 40% in an asset yielding 9%. What is the blended portfolio yield?脑筋急转弯中等数值题未尝试免费5743Quick Square-Root EstimateEstimate the square root of 2000 to one decimal place mentally.脑筋急转弯中等数值题未尝试免费5744Multiplying by ElevenMultiply 73 by 11 in your head using the digit-insertion shortcut.脑筋急转弯简单数值题未尝试免费5745Multiplying by Twenty-FiveMultiply 864 by 25 in your head using the divide-by-four shortcut.脑筋急转弯简单数值题未尝试免费5746What Percent Is X of Y45 is what percent of 360? Work it out mentally.脑筋急转弯简单数值题未尝试免费5747Up Then Down by the Same PercentA price rises 20% and then falls 20%. What is the net percentage change from the start?脑筋急转弯中等数值题未尝试免费5748Odds to Implied ProbabilityAn event is quoted at 3-to-1 odds against. What is the implied probability that it happens?脑筋急转弯简单数值题未尝试免费5749Dividing by NineDivide 5000 by 9 mentally and give the result to two decimal places.脑筋急转弯中等数值题未尝试免费