The sentence is not grammatically correct, it should be, "Last summer, Jim mowed one lawn, now he mows three." Mowed just one lawn doesn't make sense in one sentence.
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Explanation
In strophe 1, the imagery used by the chorus conveys its meaning in clear terms.
The imagery used by the chorus leader has diverse meaning attached to it. It shows that the images have their different tones and attitudes when viewed by different people.