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We connect dots with toothpicks in a grid as shown in Figure 1.14. If there are 10 horizontal toothpicks in each row and 20 vertical ones in each column, how many total toothpicks are there? |
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Answer» 430 Step-by-step EXPLANATION:In each ROW there is one more dot than there are HORIZONTAL toothpicks, and in each column there is one more dot than there are vertical toothpicks, so: Number of horizontal toothpicks = 10*(20 + 1) = 210 Number of vertical toothpicks = 20*(10 + 1) = 220 Total number of toothpicks = 430 |
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