If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be ______ hours.
Solution:
No. of Persons No. of Hours
45 20
75 x = ?
The number of persons and number of hours are inversely proportional.
If 75 persons work then the time taken to complete the work will be:
x = 20 × (45/75)
x = 20 × (3/5)
x = 4 × 3
x = 12 days = 12 × 24 = 288 hours
✦ Try This: If 75 persons can complete a work in 25 hours, then the time taken by 125 person will be ______ hours.
No. of Persons No. of Hours
75 25
125 x = ?
If 125 persons work then the time taken to complete the work will be:
x = 25 × (75/125)
x = 25 × (3/5)
x = 5 × 3
x = 15 hours
If 75 persons can complete a work in 25 hours, then the time taken by 125 persons will be 15 hours.
☛ Also Check: NCERT Solutions for Class 8 Maths Chapter 13
NCERT Exemplar Class 8 Maths Chapter 10 Problem 41
If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be ______ hours.
Summary:
If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be 288 hours.
☛ Related Questions:
- Devangi travels 50 m distance in 75 steps, then the distance travelled in 375 steps is _______ km.
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