Answers ( 5 )
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90 + 501 = 591
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60 + 12 = 72
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70 + 12 = 82
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56 + 82 = 138
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50 + 300 + 50 + 100
= ( 50 + 50 ) + ( 100 + 300 )
= 100 + 400
= 500