Question

Fourteen-year-old Shirley collects one coin from every country that she visits. If she currently has collected 18 coins and wants to accumulate at least 82 coins by the time she is 30, what is the minimum number of countries she should visit on average each year until then?

Answer 1

Answer: 4

Step-by-step explanation:

When Shirley is thirty - 82

Difference between ages = 30 - 14 = 16

Difference between coins over the years = 82 - 18 = 64

Therefore, Average countries she visited = 64 / 16 = 4

Answer 2

She need to visit at least 4 countries each year.

Step-by-step explanation:

Consider the provided information.

Shirley is 14 year old and she has 18 coins.

She want to collect 82 coins by the time she is 30.

The number of more coins she needs = 82-18 = 64 coins

Difference between ages = 30 - 14 = 16  years

Now find the average by dividing the number of coins with difference of age.

$Average=\dfrac{64}{16} =4$

Hence, she need to visit at least 4 countries each year.

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