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?
A
0 workers
B
10 workers
C
12 workers
D
15 workers
উত্তরের বিবরণ
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
X can do a work in 10 days and Y in 15 days. If they work on it together for 3 days, then the fraction of the work that is left is-
Created: 2 weeks ago
A
1/3 part
B
1/2 part
C
3/4 part
D
1/4 part
Question: X can do a work in 10 days and Y in 15 days. If they work on it together for 3 days, then the fraction of the work that is left is-
Solution:
X's 1 day's work = 1/10
Y's 1 day's work = 1/15
∴ (X + Y)'s 1 day's work = (1/10) + (1/15) part
= (3 + 2)/30 part
= 5/30
= 1/6 part
∴ (X + Y)'s 3 day's work = (1/6) × 3) part
= 1/2 part
Therefore, Remaining work = 1 - (1/2) = 1/2 part
0
Updated: 2 weeks ago
Machine A paints y units in 15 minutes and machine B paints 3y units in 30 minutes. In how many minutes will A and B, working together, paint 45y units?
Created: 1 week ago
A
270 minutes
B
240 minutes
C
250 minutes
D
280 minutes
Question: Machine A paints y units in 15 minutes and machine B paints 3y units in 30 minutes. In how many minutes will A and B, working together, paint 45y units?
Solution:
Machine A paints per minute = y/15 units
Machine B paints per minute = 3y/30 = y/10 units
∴ A and B together paint per minute = y/15 + y/10
= (2y + 3y)/30
= 5y/30
= y/6 units
So, to paint y/6 units, it takes 1 minute.
Hence, to paint 45y units, time needed = (45y × 6)/y = 270 minutes.
0
Updated: 1 week ago
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?
Created: 1 week ago
A
20 days
B
24 days
C
16 days
D
30 days
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
