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24.04.2020 •
Mathematics
A collection of 109 coins is made up of quarters, dimes, and nickels. There are 7 fewer dimes than quarters and 3 less than five times as many nickels as dimes.Find the amount of the collection
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Ответ:
There are 22 quarters, 15 dimes and 72 nickels.
Step-by-step explanation:
The number of coins in the collection is 109.
Let the number of quarters = x
Let the number of dimes = y
Let the number of nickels = z
Therefore:
x + y + z = 109 (1)
There are 7 fewer dimes than quarters. This means that:
y = x - 7
=> x = y + 7
There are 3 less than five times as many nickels as dimes. This means that:
z = 5y - 3
Let us write equation (1) in terms of y to make it simpler to solve:
y + 7 + y + 5y - 3 = 109
Collecting like terms:
7y + 4 = 109
=> 7y = 105
y = 105 / 7
y = 15
Therefore:
x = 15 + 7 = 22
z = (5 * 15) - 3
z = 75 - 3 = 72
Hence, there are 22 quarters, 15 dimes and 72 nickels.
To confirm, 22 + 15 + 72 = 109
Ответ: