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sk9600930
27.06.2019 •
Mathematics
Russell has a collection of 1,200 pennies. of these pennies, 25% are dated before 1980, 35% are dated from 1980 to 2000, and the rest are dated after 2000. how many pennies in russell’s collection are dated after 2000
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Ответ:
The total pennies in Russell's collection dated after 2000 is 800
Step-by-step explanation:
Given
Total Pennies: 1,200
Pennies before 1980: 25%
Pennies between 1980 and 2000: 35%
Required
Number of pennies in Russell’s collection are dated after 2000
Let P1 represent pennies dated before 1980
Let P2 represent pennies dated between 1980 and 2000
Let P3 represent pennies dated after 2000
To calculate the number of pennies dated after 2,000. you have to understand that his total collection of pennies is 100%
This means that
P1 + P2 + P3 = 100%
Where P1 = 25% and P2 = 35%.
So, we're solving for P3
By substituting, P1 = 25% and P2 = 35%, we have
25% + 35% + P3 = 100%
60% + P3 = 100%
Make P3 the subject of formula
P3 = 100% - 60%
P3 = 40%
The quantity of pennies dated after 2,000 is then calculated by P3 * Total.
i.e. 40% * 2000
= 0.4 * 2000
= 800
Hence, the total pennies in Russell's collection dated after 2000 is 800
Ответ: