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Rishi got two halls in his house painted. It cost him $₹6,000$ and $₹6,100$ respectively to paint the $4$ walls of his $2$ square halls, of the same height. If the length of one hall exceeds the length of the other by $1$ m and the cost of painting is $₹5$ per sq.m, what is the height of the two halls?

  1. $3$ m
  2. $5$ m
  3. $7.5$ m
  4. $10$ m
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Option B. 5 m

h * a * 4 * 5 = 6000 …...(1)

h * (a+1) * 4 * 5 = 6100 …….(2)

By solving eqn (1) and (2) you will get a = 60 and h = 5

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