Question

15 mason can build the wall in 20 days how many masons
will build the wall in 12 days​

Answer 1

Step-by-step explanation:

It is inverse proportion

Let the number of masons require to build the wall in 12 days be x

15×20=12×x

x=15×20/12

x=5×5

x=25

25 masons are reqquired to build the wall in 12 days.

Answer 2

Answer:

Given :

• 15 masons can build a wall in 20 days

To Find :

• How many days it will take for 24 masons to build the same wall.

Solution :

If the number of masons will increase the number of building days will decrease and vice-versa .

We know that :

|| If two quantities are related in such a way that an increase in one causes corresponding decrease in the other and vice-versa, then such a variation is called an inverse variation. ||

Now,

Let the days 24 masons will take to build the wall be x

(Refer to the attachment for table)

Since, mason & Days vary inversely :

$\longrightarrow \sf \: 16 \times 21 = 24 \times x$

$\longrightarrow \sf \: 336 = 24 \times x$

$\longrightarrow \sf \: 336 = 24x$

$\longrightarrow \sf \: x = \cancel \dfrac{336}{24}$

$\longrightarrow \sf \: x = 14 \: days$

$\therefore$ It will take 14 days for 24 masons to build the same wall.