If 8 men or 12 women can complete a work in 40 days, how many days would it take 20 men and 18 women to complete twice the work?
A
20 days
B
24 days
C
16 days
D
30 days
উত্তরের বিবরণ
Question: If 8 men or 12 women can complete a work in 40 days, how many days would it take 20 men and 18 women to complete twice the work?
Solution:
Here,
8 men = 12 women
∴ 1 man = 12/8 = 3/2 women
∴ 20 men = 20 × 3/2 = 30 women
∴ 20 men and 18 women together = 30 + 18 = 48 women
12 women can complete the work in 40 days
∴ 1 woman can complete the work in 40 × 12 = 480 days
∴ 48 women can complete the work in 480/48 = 10 days
Hence, to do twice the work, the time needed = 10 × 2 = 20 days
0
Updated: 1 week ago
Hasan can paint 54 walls in 27 minutes. Rafiq can paint 25 walls in 10 minutes. Working together, how many walls can they paint in 20 minutes?
Created: 1 week ago
A
60 walls
B
70 walls
C
90 walls
D
100 walls
Question: Hasan can paint 54 walls in 27 minutes. Rafiq can paint 25 walls in 10 minutes. Working together, how many walls can they paint in 20 minutes?
Solution:
Hasan can paint in 1 minute = 54 ÷ 27 = 2 walls
Rafiq can paint in 1 minute = 25 ÷ 10 = 25/10 = 5/2 walls
∴ Together they can paint in 1 minute = 2 + (5/2) walls
= (4 + 5)/2 = 9/2 walls
∴ In 20 minutes, they can paint = (9/2) × 20 walls
= (9 × 20)/2
= 90 walls
0
Updated: 1 week ago
15 workers can build 45 chairs working 6 hours per day. How many extra workers are required to produce 60 chairs working 4 hours per day?
Created: 1 week ago
A
0 workers
B
10 workers
C
12 workers
D
15 workers
Question: 15 workers can build 45 chairs working 6 hours per day. How many extra workers are required to produce 60 chairs working 4 hours per day?
Solution:
6 ঘণ্টা কাজ করে 45টি চেয়ার তৈরি করে 15 জন শ্রমিক
1 ঘণ্টা কাজ করে 1টি চেয়ার তৈরি করে = (15 × 6) /45 জন শ্রমিক
4 ঘণ্টা কাজ করে 60টি চেয়ার তৈরি করে = (15 × 6 × 60)/(45 × 4) জন শ্রমিক
= 30 জন
∴ অতিরিক্ত শ্রমিকের সংখ্যা = 30 - 15 = 15 জন
0
Updated: 1 week ago
P and Q can do a job in 3 days. Q and R can do the same job in 4 days, while R and P can do it in 12 days. In how many days the job will be finished when P, Q and R working together.
Created: 2 weeks ago
A
10 days
B
3 days
C
4 days
D
12 days
Question: P and Q can do a job in 3 days. Q and R can do the same job in 4 days, while R and P can do it in 12 days. In how many days the job will be finished when P, Q and R working together.
Solution:
Given that,
(P + Q)'s 1 day's work = 1/3
(Q + R )'s 1 day's work= 1/4
and
(R + P)'s 1 day's work = 1/12
Now, (P + Q) + (Q + R) + (R + P) = 2(P + Q + R)'s 1 day's work = (1/3) + (1/4) + (1/12)
= (4 + 3 + 1)/12
= 8/12 = 2/3
∴ (P + Q + R)'s 1 day's work = 2/(3 × 2) = 1/3
So, P + Q + R can complete the job in = 3 days
0
Updated: 2 weeks ago
