A nickel is worth 5 cents so one dollar is the same as 20 nickels. $7 would then be 20 * 7 = 140 coins.
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One nickel is equal to 0.05 dollars. Therefore, 7 nickels is equal to 7 x 0.05 = 0.35 dollars.
There are 20 nickels in a dollar, so 20 x 7 =140
There are 40 nickels in 2 dollars.
90 dollars. There are 20 nickels in a dollar so 1800 nickels = 1800/20 dollars
2000 nickels
There are 100 nickels in 5 dollars.