Direct and Inverse Proportion

If 5 workers can build a wall in 10 days, how many workers are needed to build the same wall in 5 days?

• 12

• 8

• 15

• 10

If 8 machines can produce 400 units in 6 hours, how many machines are needed to produce 600 units in 4 hours?

• 18 machines

• 20 machines

• 15 machines

• 22 machines

If 12 workers can complete a project in 8 days, how many days will it take for 6 workers to complete the same project?

• 24

• 16

• 10

• 14

If 15 students can finish a task in 5 hours, how long will it take for 25 students to finish the same task?

• 4 hours

• 3 hours

• 6 hours

• 2 hours

If 20 workers can paint a house in 4 days, how many days will it take for 10 workers to paint the same house?

• 10

• 6

• 12

• 8

If 30 machines can produce 600 items in 3 hours, how many machines are needed to produce 800 items in 2 hours?

• 45

• 68

• 52

• 73

If 18 workers can build a bridge in 12 days, how many days will it take for 9 workers to build the same bridge?

• 24

• 18

• 36

• 9

If 24 students can complete a project in 6 hours, how long will it take for 36 students to complete the same project?

• 5 hours

• 3 hours

• 4 hours

• 8 hours

If 25 workers can harvest a field in 5 days, how many days will it take for 15 workers to harvest the same field?

• 10 days

• 3.5 days

• 6.25 days

• 8.33 days

If 40 machines can produce 800 items in 4 hours, how many machines are needed to produce 1200 items in 3 hours?

• 80 machines

• 150 machines

• 60 machines

• 100 machines