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ellis is thinking of two numbers. they each have two digits. the sum of the two numbers is 100. the first number is 20 more than the second number. what are the two numbers ellis is thinking of?
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1 Answer

line 1: x+y=100

line 2: y=x+20

x+(x+20)=100

2x+20=100

2x=80

x=40

y=60
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