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- The first volume of the seventh grade exercises the mathematical answers synchronously.
The first volume of the seventh grade exercises the mathematical answers synchronously.
Suppose A X is old and B 50-X. According to the topic, A is older. When a is 50-x, a is backward. X-(50-x)=2x-50 years old, then B is 50-x-(2x-50)= 100-3x.
50-x=2( 100-3x) x=30, so A 30 B 20.
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