networking - Is this subnetting is correct?

Question

Is this question is correct! Please guide me how to solve it.

An Internet Service Provider has newly been established, the ISP has bought 172.20.0.0/20 subnet.

a. In the first month, ISP has 10 customers
b. 8 of the customers need single (one) IP address for their businesses
c. 9th customer needs 4 IP addresses.
d. While 10th customer needs 10 IP address
e. You have 2 tasks to accomplish in this scenario:
      i. You need to do subnetting Using VLSM
      ii. Do subnetting without wasting IP Addresses

Thanks in advance.

Answer 1

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