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Class 9-10, JEE & NEET
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Two salesmen make equal sales during the month of August. In September, each salesman doubles his sale of the month of August. Compare their sales in September.
Let the equal sale of two salesmen in August be $x$.
In September each salesman doubles his sale of August.
Thus, sale of first salesman is $2 x$ and sale of second salesman is $2 x$.
According to Euclid's axioms, things which are double of the same things are equal to one another.
So, in September their sales are again equal.