Question
Three containers contain an average of 42 ℓ of liquid detergent. The 1st container contains 51 ℓ of liquid detergent and the 2nd container contains 9 ℓ more liquid detergent than the 1st container. How much liquid detergent does the 3rd container contain?
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Three containers contain an average of 42 ℓ of liquid detergent. The 1st container contains 51 ℓ of liquid detergent and the 2nd container contains 9 ℓ more liquid detergent than the 1st container. How much liquid detergent does the 3rd container contain?