Math, asked by preklavyashukla1648, 3 months ago

6 men can complete the electric fitting in a building in 7days. How many days will it take 21 men to do the job?​

Answers

Answered by bhargav200508
1

Step-by-step explanation:

2men can complete the job in = 7 days 1 man can complete the job in = 6 × 7 = 42 days

∴ 21 men can complete the job in = 42/21 = 2 answer

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Answered by XxxRAJxxX
2

Answer:

2 days.

Step-by-Step Explanation:

→ 6 men can complete the electric fitting in a building in 7 days. So,  6 \ratio 7

→ 21 men can do the job in  a days. So,  21 \ratio a

We get,

 \therefore 6 \ratio 7 \ratio \ratio 21 \ratio a

If the number of men will increase, So, the number of days for the job will decrease. Hence, here is inverse proportion.

Since in inversely proportional term, where x and y has two variations,

\it x_1 x_2 = y_1 y_2 = k

Where, k is a constant term.

Here,

x :-  x_1 = 6, \: x_2 = 7

y :-  y_1 = 21, \: y_2 = a

Therefore,

 \therefore \rm 6 \times 7 = 21 \times a

 \implies \rm 42 = 21a

 \implies \rm a = \frac{42}{21}

 \implies \rm a = \cancel{\frac{42}{21}}

 \implies \rm \bf a = 2

Hence, 21 men can do that job in 2 days.

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