Question: ( 2 1 ) Mark can mow a lawn in 2 0 minutes less rime than his sister Manik. Togecher they can mow the lawn

(21) Mark can mow a lawn in 20 minutes less rime than his sister Manik. Togecher they can mow the lawn in 24 minutes. How long waid is take Marie to finish the mowing if she worked alone?

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