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प्रश्न
In a school there is 7 periods a day each of 45 minutes duration. How long each period is if the school has 9 periods a day assuming the number of hours to be the same?
उत्तर
Number of periods increases as duration decreases, since the number of hours is same.
Let the duration of each period be x.
| Number of periods | 7 | 9 |
| Duration of period (min) | 45 | x |
x1y1 = x2y2
7 × 45 = 9 × x
x = `(7 xx 45)/9`
x = 35
Duration of every period = 35 min
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