15 persons completed a job in 7 days. how many days will 10 persons take to complete the same job? 1) 10 days 2) 11 2 1 days 3) 9 2 1 days 4) 10 2 1 days
Answers
The number of people is inversely proportional to the number of days needed.
⇒ the more people we have, the fewer days we need.
⇒ the fewer people we have, the more days we need.
15 people = 7 days (Given)
Find the number of days needed for 1 people to complete the work:
15 people = 7 days
1 person = 7 x 15 = 105 days
Find the number of days needed for 10 people to complete the work:
1 person = 105 days
10 people = 105 ÷ 10 = 10.5 days
Answer: 10 people will need 10.5 days to complete the work.
The quantity of individuals is contrarily relative to the quantity of days required.
⇒ the more individuals we have, the less days we require.
⇒ The less individuals we have, the more days we require. 15 individuals = 7 days (Given) Find the quantity of days required for 1 individuals to finish the work: 15 individuals = 7 days 1 individual = 7 x 15 = 105 days.
Find the quantity of days required for 10 individuals to finish the work: 1 individual = 105 days 10 individuals = 105 ÷ 10 = 10.5 days.