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प्रश्न
A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the number of school hours to be the same?
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उत्तर
Let the duration of each period, when there are 9 periods a day in the school, be x minutes. The following table is obtained:
| Duration of each period (in minutes) | 45 | x |
| Number of periods | 8 | 9 |
45 × 8 = x × 9
`x= (45 xx 8)/9 `
x = 40
Hence, in this case, the duration of each period will be 40 minutes.
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