Question
Three pails contain an average of 42 ℓ of dettol. The 1st pail contains 55 ℓ of dettol and the 2nd pail contains 11 ℓ more dettol than the 1st pail. How much dettol does the 3rd pail contain?
2 m

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Three pails contain an average of 42 ℓ of dettol. The 1st pail contains 55 ℓ of dettol and the 2nd pail contains 11 ℓ more dettol than the 1st pail. How much dettol does the 3rd pail contain?