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?
thx
To find out the minimum number of countries Shirley should visit on average each year until she turns 30, we can set up an equation.
Let's assume Shirley has to visit an equal number of countries each year to collect all the remaining coins she needs. Let x represent the average number of countries she needs to visit each year.
From her current collection of 18 coins, Shirley needs to collect an additional 82 - 18 = 64 coins.
Shirley has a time frame of 30 - 14 = 16 years to collect the remaining coins.
Therefore, the average number of countries she should visit each year is given by:
x = total number of coins needed / total number of years
x = 64 coins / 16 years
x = 4 coins / year
The average number of countries Shirley should visit each year is 4.
Well 30- 14 = 16 years to collect
The coins she wants are 82 and she has 18
so
82 - 18 then divide by the 16 years she has to collect : )