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प्रश्न
In a rectangular plot, 5 square flower beds of side (x + 2) metres each have been laid (see the figure). Find the total cost of fencing the flower beds at the cost of ₹ 50 per 100 metres:
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उत्तर
Given, side of one square flower bed = (x + 2) m
∴ Perimeter of one square flower bed = 4(Side) = 4(x + 2) m
Now, total perimeter of 5 such square flower beds = 5 × Perimeter of one square
= 5 × 4(x + 2)
= 20(x + 2) m
∵ Cost of fencing of 100 m = ₹ 50
∴ Cost of 1 m = ₹ `50/100`
∴ Cost of 20(x + 2) m = `50/100 xx 20(x + 2)`
= 10(x + 2)
= ₹ (10x + 20)
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संबंधित प्रश्न
Observe the patterns of digits made from line segments of equal length. You will find such segmented digits on the display of electronic watches or calculators.
If the number of digits formed is taken to be n, the number of segments required to form n digits is given by the algebraic expression appearing on the right of each pattern.
How many segments are required to form 5, 10, 100 digits of the kind −
Use the given algebraic expression to complete the table of number patterns.
| S. No |
Expression |
Terms | |||||||||
| 1st | 2nd | 3rd | 4th | 5th | ... | 10th | ... | 100th | ... | ||
| 1 | 2n - 1 | 1 | 3 | 5 | 7 | 9 | - | 19 | - | - | - |
| 2 | 3n + 2 | 5 | 8 | 11 | 14 | - | - | - | - | - | - |
| 3 | 4n + 1 | 5 | 9 | 13 | 17 | - | - | - | - | - | - |
| 4 | 7n + 20 | 27 | 34 | 41 | 48 | - | - | - | - | - | - |
| 5 | n2 + 1 | 2 | 5 | 10 | 17 | - | - | - | - | 10001 | - |
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+ 
– 
