Answer: 18/25 ; or, write as: 0.72 .
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Step-by-step explanation:
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9/20 * 4/5 = (9*4) / (10*5) = 36/50 ;
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36/50 = (36÷2) / (50÷2) = 18/25 ; or, write as: 0.72 .
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