The task is to generate the correct answer for a given math problem.

Q: Problem: the average weight of a group of boys is 30 kg . after a boy of weight 45 kg joins the group , the average weight of the group goes up by 1 kg . find the number of boys in the group originally ?

A: 14
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Q: Problem: ajay can ride 50 km in 1 hour . in how many hours he can ride 1000 km ?

A: 20 hrs
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Q: Problem: 5358 x 71 = ?

A:
38041
****