Question
Three pails contain an average of 40 ℓ of detergent. The 1st pail contains 53 ℓ of detergent and the 2nd pail contains 12 ℓ more detergent than the 1st pail. How much detergent does the 3rd pail contain?
2 m

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Three pails contain an average of 40 ℓ of detergent. The 1st pail contains 53 ℓ of detergent and the 2nd pail contains 12 ℓ more detergent than the 1st pail. How much detergent does the 3rd pail contain?