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प्रश्न
6 men can complete the electric fitting in a building in 7 days. How many days will it take if 21 men do the job?
उत्तर
\[\text{ It is given that 6 men can complete a job in 7 days } . \]
\[ \therefore \text{ Time taken by 1 man to complete the same job } = \left( 6 \times 7 \right) = 42 \text{ days } \]
\[ \therefore \text{ Time taken by 21 men to complete the same job } = \frac{42}{21} = 2 \text { days } \]
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| Mixture A | Mixture B |
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Campus and Welfare Committee of school is planning to develop a blue shade for painting the entire school building. For this purpose various shades are tried by mixing containers of blue paint and white paint. In the following mixtures, decide which is a lighter shade of blue and also find the lightest blue shade among all of them.
| Mixture C | Mixture D |
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Match each of the entries in Column I with the appropriate entry in Column II
| Column I | Column II |
| 1. x and y vary inversely to each other | A. `x/y` = Constant |
| 2. Mathematical representation of inverse variation of quantities p and q |
B. y will increase in proportion |
| 3. Mathematical representation of direct variation of quantities m and n |
C. xy = Constant |
| 4. When x = 5, y = 2.5 and when y = 5, x = 10 | D. `p oo 1/q` |
| 5. When x = 10, y = 5 and when x = 20, y = 2.5 | E. y will decrease in proportion |
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| 8. If x and y vary directly then on decreasing x | H. x and y vary inversely |
| I. `p oo q` | |
| J. `m oo 1/n` |
