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

Problem: in how many no . between 10 and 30 exactly two of the digits is 2 ?
1

Problem: a bullet train covers a distance in 50 min , if it runs at a speed of 48 kmph on an average . the speed at which the bullet train must run to reduce the time of journey to 40 min will be .
60 kmph

Problem: by investing in 1623 % stock at 64 , one earns rs . 1800 . the investment made is

s . 691