A total of 20 toys of a child are to be put in a box. Every 30 seconds 2 toys are put inside but 1 is thrown out by the child. How much time (in minutes) will it take to put all toys in the box for the first time?
Given:
A total of 20 toys of a child are to be put in a box. Every 30 seconds 2 toys are put inside but 1 is thrown out by the child.
Solution:
In first 30 sec. we have 1 toys in the box.
In 1 min we have 2 toys in the box.
In similar fashion, in 9 min. we have 18 toys in the box.
But next 30 sec. makes the box full with 20 toys.
Hence it takes 9.5 min.
Final Answer: (b)
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