Tick (✓) the correct answer:
3 persons can build a wall in 4 days, then 4 persons can build it in
(a) $5 \frac{1}{3}$ days
(b) 3 days
(c) $4 \frac{1}{3}$ days
(d) none of these

Open in App

Solution

(b) 3 days
Let x be number of days taken by 4 persons to build the wall.

No. of persons 3 4

No. of days 4 $x$

More number of persons will take less time to build the wall.
So, it is a case of inverse proportion.

$Now, 3 \times 4 = 4 \times x \Rightarrow x = 3$

Therefore, 4 persons can build the wall in 3 days.

Suggest Corrections

Similar questions

3 persons can build a wall in 4 days, then 4 persons can build it in

(a) $5 \frac{1}{3} d a y s$ (b) 3 days

A can do a piece of work in 15 days. B is 50% more efficient than A. B can finish the total work in
(a) 10 days
(b) $7 \frac{1}{2}$ days
(c) 12 days
(d) $10 \frac{1}{2}$ days

Q. Mark (✓) against the correct answer
45 cows can graze a field in 12 days. How many cows will graze the same field in 9 days?

(a) 60 days
(b)

38 \frac{3}{4}

days
(c) 54 days
(d) none of these

Q. Tick (✓) the correct answer:
A works twice as fast as B. If both of them can together finish a piece of work in 12 days, then B alone can do it in
(a) 24 days
(b) 27 days
(c) 36 days
(d) 48 days

A can do a piece of work in 15 days. 13 is 50% more efficient than A. B can finish it in

(a) 10 days

(b) $7 \frac{1}{2}$ days

(d) $10 \frac{1}{2}$ days

Join BYJU'S Learning Program

Tick (✓) the correct answer: 3 persons can build a wall in 4 days, then 4 persons can build it in (a) 513 days (b) 3 days (c) 413 days (d) none of these

(b) 3 days Let x be number of days taken by 4 persons to build the wall. No. of persons 3 4 No. of days 4 x More number of persons will take less time to build the wall. So, it is a case of inverse proportion. Now, 3×4=4×x⇒x=3 Therefore, 4 persons can build the wall in 3 days.

Tick (✓) the correct answer:
3 persons can build a wall in 4 days, then 4 persons can build it in
(a) $5 \frac{1}{3}$ days
(b) 3 days
(c) $4 \frac{1}{3}$ days
(d) none of these