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-
A
1/3 part
B
1/2 part
C
3/4 part
D
1/4 part
উত্তরের বিবরণ
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 months 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 month 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 month ago
If 6 men can build a wall in 8 days, how many days will 12 men take to build the same wall?
Created: 1 month ago
A
4 days
B
6 days
C
8 days
D
10 days
Question: If 6 men can build a wall in 8 days, how many days will 12 men take to build the same wall?
Solution:
6 জন লোক একটি দেয়াল 8 দিনে তৈরি করতে পারে।
1 জন লোক সেই দেয়াল তৈরি করতে লাগবে = (8 × 6) দিন
12 জন লোক সেই দেয়াল তৈরি করতে লাগবে = (8 × 6)/12 দিন
= 4 দিন
0
Updated: 1 month ago
Musa can do 1/4 of a work in 6 days. In how many days will he complete the work?
Created: 2 months ago
A
24 days
B
12 days
C
36 days
D
15 days
Question: Musa can do 1/4 of a work in 6 days. In how many days will he complete the work?
Solution:
Musa can do 1/4 of a work in 6 days.
∴ He will complete the work in = 6 × 4 = 24 days
∴ Musa will complete the work in 24 days.
0
Updated: 2 months ago
