सविस्तर स्पष्टीकरण (Detailed Explanation):
अचूक उत्तर: पर्याय (1)
दिलेल्याप्रमाणे:
A ने पूर्ण केलेले काम = 4 मिनिटे, B ने पूर्ण केलेले काम = 5 मिनिटे, C ने पूर्ण केलेले काम = 6 मिनिटे, D ने पूर्ण केलेले काम = 10 मिनिटे, E ने पूर्ण केलेले काम = 12 मिनिटे.
वापरलेले सूत्र::
सरासरी = \(\dfrac{sum \ of \ observation}{number \ of \ observation}\)
गणना:
समस्येनुसार,
\(\dfrac{1/4 + 1/5 + 1/6 + 1/10 + 1/12}{5}\)
= \(\dfrac{15 + 12 + 10 + 6 + 5}{60}\) × \(\dfrac{1}{5}\)
= \(\dfrac{48}{60}\) × \(\dfrac{1}{5}\)
= \(\dfrac{4}{25}\)
= 0.16
∴ उत्तर 0.16 आहे
Shortcut Trick
Work done per minute: A = 0.25, B = 0.20, C = 0.166, D = 0.10, E = 0.083
Total units of work completed per minute = 0.25 + 0.20 + 0.166 + 0.10 + 0.083 = 0.80
Average units per minute = Total work per minute ÷ Number of persons
Average = 0.80 ÷ 5 = 0.16
∴ The correct answer is 0.16.
Alternate Method
Given: Time taken by A = 4 min, B = 5 min, C = 6 min, D = 10 min, E = 12 min.
Formula Used: Efficiency (Work per minute) = Total Work ÷ Time taken.
Let the Total Work be the LCM of 4, 5, 6, 10, and 12 = 60 units.
+--------+------+------------+------------+
| Person | Time | Total Work | Efficiency |
+--------+------+------------+------------+
| A | 4 | 60 | 15 |
| B | 5 | 12 | |
| C | 6 | 10 | |
| D | 10 | 6 | |
| E | 12 | 5 | |
+--------+------+------------+------------+
⇒ Combined Efficiency = 15 + 12 + 10 + 6 + 5 = 48 units
⇒ Total work done per minute (relative to 1 unit of whole work) = 48 ÷ 60
⇒ Total work per minute = 0.8
⇒ Average units per person per minute = 0.8 ÷ 5
⇒ Average = 0.16
∴ The correct answer is 0.16.
Related Concepts:
Rate of Work
Rate is the amount of work completed in one unit of time. Rate = 1 ÷ Time taken to complete the whole work.
Combined Work Rate
When multiple people work together, their combined rate per unit of time is the sum of their individual rates: R_(total) = R_(1) + R_(2) + ... + R_(n).
Average Rate
Average units of work per person per minute = Total rate ÷ Total number of people.