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Question

If you have to choose between ladders of lengths 5, 10, and 15 meters to reach the 15th and the 30th floor as soon as possible, which ladder you'll choose?
  1. None of them is useful
  2. 15 meters
  3. 10 meters
  4. 5 meters


Solution

The correct option is B 15 meters
To pick a ladder, we need to find which length of the ladder is appropriate for reaching both the floors in one go.

So, we need to find the common factors of 15 and 30.

Factors of 15
1 × 15
3 × 5

Factors of 30
1 × 30
2 × 15
3 × 10
5 × 6

We can use the ladders of length 5 m or 15 m.
Since we have to reach both the floors faster, we'll pick the bigger ladder, which is 15 meters long.

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