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Do not combine the given numbers by instinct. Find the value of one basic unit first, then build the total. If something doubles each day and is complete on day 48, it was half complete on day 47. If five machines make five widgets in five minutes, one machine makes one widget in five minutes. For a round trip, average speed is total distance divided by total time, never the average of the two speeds. In every case, write down what one unit does or what happens one step earlier, then add or divide as the situation requires. The trap is always the quick arithmetic; the fix is tracking the real quantities.
Curated
3| # | Title | Difficulty | Tags | |
|---|---|---|---|---|
| 18 | The lily padDoubling | Easy | ||
| 19 | Five machinesRates | Easy | ||
| 21 | There and backA sneaky average | Medium |
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