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A problem in the sixth grade mathematics entrance exam in Donghua (2010);
There are x people in the second workshop now.

Because there are 40*( 1- 10%) in the first workshop now, according to the fact that the number of people in the first workshop is less than 80% of the number of people in the second workshop, the equation is obtained:

40 * (1-10%) = 80% x-4, and the solution is X=50.

There are 50 people in the second workshop now.