Problem 1 :
If 6 note books cost $45, then how much 8 note books costs?
Problem 2 :
The fence of a hospital is to be repainted by a group of workers. If 6 workers can paint 520.2 m of the wall in an hour, then how many meters of the wall will 7 workers paint in an hour?
Problem 3 :
18 mangoes cost $36. If David has $24, how many mangoes can he buy?
Problem 4 :
A Publisher makes 3300 books in the month of November. If they make the same quantity of books every day, then how many books can they make in a leap year?
Problem 5 :
47 baskets of mangoes weigh 16.403 kilograms. Find the weight of 18 baskets of mangoes (Round to 2 digits of decimal).
Problem 6 :
We can buy 9 units of a product for $102.60. How much money do we need, if we want to buy 12 units of the same product?
Problem 8 :
8 men can complete a work in 25 days working 5 hours per day. If 5 men can complete the same work in 20 days, how many hours does each man have to work per day?
1. Answer :
Given : 6 note books cost $45
Cost of one note book is
= 45/6
= $7.50
Cost of 8 note books is
= 8 ⋅ 7.50
= $60
2. Answer :
Given : 6 workers can paint 520.2 m of the wall in an hour
Length of the wall can be painted by 1 worker in an hour is
= 520.2/6
= 86.7 meters
Length of the wall can be painted by 7 workers in an hour is
= 7 ⋅ 86.7
= 606.9 meters
3. Answer :
Given : 18 mangoes cost $36
Cost of one mango is
= 36/18
= $2
No. of mangoes can be bought for $24 is
= 24/Cost of 1 mango
= 24/2
= 12
Hence, David can buy 12 mangoes for $24.
4. Answer :
Given : The Publisher makes 3300 books in the month of November.
In any year, the month November has 30 days.
Then, no. of books made per day is
= 3300/30
= 110
If an year is a leap year, then it would have 366 days.
So, no. of books can be made in a leap years is
= 366 ⋅ 110
= 40,260
5. Answer :
Given : 47 baskets of mangoes weigh 16.403 kilograms.
Weight of 1 basket is
= 16.403/47
= 0.349 kilograms
Weight of 18 baskets is
= 18 ⋅ 0.349
= 6.282
≈ 6.28 kilograms
6. Answer :
Given : Cost of 9 units of the product is $102.60
Cost of 1 unit of the product is
= 102.60/9
= $11.40
Cost of 12 units of the product is
= 12 ⋅ 11.40
= $136.80
7. Answer :
Given : 5 men can complete the work in 20 days working 8 hours per day.
Number of hours required for one man to complete the same work is
= No. of men ⋅ No. of days ⋅ No. of hours per day
= 5 ⋅ 20 ⋅ 8
= 800 hours
8. Answer :
Given : 8 men can complete the work in 25 days working 5 hours per day.
Number of hours required for one man to complete the same work is
= No. of men ⋅ No. of days ⋅ No. of hours per day
= 8 ⋅ 25 ⋅ 5
= 1000 hours
If there are 5 men, then the number of hours that each man has to work to complete the work is
= 1000/5
= 200 hours
Given : The work has to be completed in 20 days.
So, the number of hours that each man has to work per day is
= 200/20
= 10 hours
Hence, 5 men can complete the same work in 20 days working 10 hours per day.
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