If x and y are two 3-digit numbers such that,x+y =120 and difference between x and y is 20,then find the number.
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Answer:
x+y=120>equation 1
x-y=20
x+y=120+x-y=20=
2x=140
x=140/2
x=70
substitute in equation 1
x+y=120
70+y=120
y=120-70
y=50
Therefore, x=70
y=50
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