Advertisements
Advertisements
Question
24 workers can build a wall in 15 days. How many days will 9 workers take to build a similar wall?
Solution
Number of days taken by 24 workers to build a wall = 15 days
Number of days taken by 1 worker to build the wall = 15 × 24 = 360 days (less worker means more days)
Number of days taken by 9 workers to build the wall = `360/9` = 40 days
APPEARS IN
RELATED QUESTIONS
Find the third proportional to `2 2/3` and 4
Find two nurnbers whose mean proportional is 12 and the third proportional is 324.
What number must be added to each of the numbers 6, 15, 20 and 43 to make them proportional?
If b is the mean proportional between a and c, prove that `(a^2 - b^2 + c^2)/(a^-2 -b^-2 + c^-2)` = b4.
If q is the mean proportional between p and r, prove that
`p^2 - q^2 + r^2 = q^4[(1)/p^2 - (1)/q^2 + (1)/r^2]`.
If 22.5 m of a uniform iron rod weighs 85.5 kg, what will be the weight of 5 m of the same rod?
The ratio 92 : 115 in its simplest for is
If a, b, c and d are in proportion, prove that: `(a^2 + ab)/(c^2 + cd) = (b^2 - 2ab)/(d^2 - 2cd)`
Write the mean and extreme terms in the following ratios and check whether they are in proportion.
78 litre is to 130 litre and 12 bottles is to 20 bottles
The table, given below, shows the values of x and y, where x is proportional (directly proportional) to y.
| x | A | 24 | 15 |
| y | 12 | B | 20 |
The values of A and B are:
