Chain Rule Questions

If 12 students can read 4800 pages of a book in 15 days, then how many students can read 7200 pages of the same book in 10 days?

30 persons working 10 hours a day can do 5 units of work in 12 days. How many people are required to do 8 units of that work in 16 days if they work for 8 hours a day?

120 men consume 720kg of rice in 30 days. In how many days can 90 men consume 270kg?

$39$ persons can repair a tunnel in $12$ days working $10$ hours a day. In how many days will $30$ persons working $6$ hours a day complete the work?

If 15 apples cost as much as 6 strawberries, 2 strawberries cost as much as 16 bananas, 6 bananas cost as much as 15 potatoes, then what is the cost of 1 potato if an apple costs ₹ 20?

Eight labourers working 10 hours a day completed a work in 18 days. If only 5 labourers are working, then in how many hours a day should they work to finish the work in 24 days?

If $45$ men can build a wall of $360\text{m}$ length in $18$ days, then how many men are required to build the same wall of $180\text{m}$ length in $15$ days?

If 72 boys can build a wall of $280\text{m}$ length in 21 days, how many boys would take 18 days to build a similar type of wall of length $200\text{m}$?

By working 12 hours a day, 90 people can complete a work in 16 days. How much work will be left after 24 days if 70 people work for 8 hours per day?

If $72$ persons build a $220\text{-m-long}$ wall in $6$ days, then how many persons will be required to build the same type of wall of $550\text{-m}$ length in $5$ days?

In a military camp, there was sufficient food for $190$ days for a total of $4000$ men. After $30$ days, $800$ men left the camp. The remaining men will spend the remaining food provisions in how many days?

The cost of printing a magazine of $540$ pages with $30$ lines on each page and $15$ words in each line is $\text{Rs. }7200$. Find the cost of printing a magazine of $450$ pages with $35$ lines on each page and $18$ words in each line.

A laboratory has to pay $\text{Rs. }67.50$ for $30$ days as a gas bill if it uses $35$ gas burners for $6\text{hours}$ a day. Find the amount to be paid if it uses $30$ gas burners for $18$ days working $7\text{hours}$ a day.