Question
Three containers contain an average of 42 ℓ of dettol. The 1st container contains 51 ℓ of dettol and the 2nd container contains 10 ℓ more dettol than the 1st container. How much dettol does the 3rd container contain?
2 m

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Three containers contain an average of 42 ℓ of dettol. The 1st container contains 51 ℓ of dettol and the 2nd container contains 10 ℓ more dettol than the 1st container. How much dettol does the 3rd container contain?