Each packet of washing powder carries a token and four tokens can be exchanged for a free packet. How many free packets will I receive if I buy 64 packets ?

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answer is D.

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Detailed Solution

Concep- By dividing the total number of packets by the total tokens offering free packets, we can get the total number of free packets. Each free packet also includes a token, and accumulating them guarantees receiving further free packets. By adding up all the free packets, the total number is determined.
Given information:
1 packet of washing powder = 1 token
1 free packet of washing powder = 4 tokens
Number of packets bought = 64
Now,
The number of free packets

n f 1

when 64 packet are bought is given by its division with number of tokens providing free packets which is given as:

n f 1 = 16

→

. With 64 packets, there are 16 free packets total.
These 16 packets came with 16 tokens, making the total amount of free packets from this:

n f 2 = 164

= 4

→

With 16 packets, there are 4 free packets total.
The total amount of free packets acquired by doing this is 4 plus the additional 4 tokens that come wit