Advertisements
Advertisements
प्रश्न
A work-force of 420 men with a contractor can finish a certain piece of work in 9 months. How many extra men must he employ to complete the job in 7 months?
Advertisements
उत्तर
Let x be the extra number of men employed to complete the job in 7 months.
| Number of men | 420 | x |
| Months | 9 | 7 |
\[\text{ Since the number of men hired and the time required to finish the piece of work are in inverse variation, we have } : \]
\[420 \times 9 = 7x\]
\[ \Rightarrow x = \frac{420 \times 9}{7}\]
\[ = 540\]
\[\text{ Thus, the number of extra men required to complete the job in 7 months } = 540 - 420 = 120\]
संबंधित प्रश्न
Which of the following are in inverse proportion?
The time taken for a journey and the distance travelled in a uniform speed.
It x and y vary inversely, fill in the following blank:
| x | 16 | 32 | 8 | 128 |
| y | 4 | ... | ... | 0.25 |
Two quantities are said to vary ______ with each other if an increase in one causes a decrease in the other in such a manner that the product of their corresponding values remains constant.
If 12 pumps can empty a reservoir in 20 hours, then time required by 45 such pumps to empty the same reservoir is ______ hours.
Length of a side of an equilateral triangle and its perimeter vary inversely with each other.
If d varies directly as t2, then we can write dt2 = k, where k is some constant.
If a and b vary inversely to other, then find the values of p, q, r ; x, y, z and l, m, n.
| a | l | 9 | n | 6 |
| b | 5 | m | 25 | 10 |
At a particular time, the length of the shadow of Qutub Minar whose height is 72 m is 80 m. What will be the height of an electric pole, the length of whose shadow at the same time is 1000 cm?
Two persons could fit new windows in house in 3 days.
How many persons would be needed to fit the windows in one day?
