A person of mass 60 kg wants to lose 5kg by going up and down a 10 m high stairs. Assume he burns twice as much fat while going up than coming down. If 1 kg of fat is burnt of expending 7000 k cal, how many times must he go up and down to reduce his weight by 5 kg ?

Explanation

To solve the problem of how many times a person must go up and down a 10 m high staircase to lose 5 kg, we will follow these steps:

### Step 1: Calculate the total energy required to lose 5 kg of fat.
The energy required to burn 1 kg of fat is 7000 kcal. Therefore, to lose 5 kg:
\[ \text{Total energy} = 5 \, \text{kg} \times 7000 \, \text{kcal/kg} = 35000 \, \text{kcal} \]

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