Single rule of three inverse online

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Inverse proportion is, where more requires less, and less requires more.

For example:

If 8 men can paint a wall in 4 days, how long will 6 men take to paint a similar wall? Answer: a: 8, b: 4, c: 6, x: 5.33333 (days)

If 6 days are required to move a sandpile using 10 trucks, how many trucks are required to move the same sandpile within 4 days? Answer: a: 6, b: 10, c: 4, x: 15 (trucks)


  • Value of a
  • Value of b
  • Value of c
  • Number of decimal places (round)


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