The task is to generate the correct answer for a given math problem.
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Question: Problem: a jar contains a mixture of ab in the ratio 4 : 1 . when 40 l of mixture is replaced with liquid b , ratio becomes 2 : 3 . how many liters of liquid a was present in mixture initially .

Answer: 64

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

Answer: 20 hrs

Question: Problem: the length of a rectangular landscape is 3 times its breadth . there is a playground in it whose area is 1600 square mtr & which is 1 / 3 rd of the total landscape . what is the length of the landscape ?

Answer:
150