Twenty pennies.
25 cents subtract 5.
Two Zero Cents
The answer will depend on what cents: US cents, Euro cents or other countries' cents. Different countries use different coinage: the US has a 25 cents coin but but not 20 cents whereas the Euro has a 20 cent coin and not 25.
50 percent of 20 cents = 10 cents
20 cents is twenty pennies.
Nickels are 5 cents each so if you have 4 nickels and you're trying to find the total you take 5x4=20.
You can make 20 cents with 7 coins by using 1 half dollar (50 cents), 1 quarter (25 cents), 1 dime (10 cents), and 4 pennies (4 cents). However, to specifically achieve 20 cents, you can use 1 nickel (5 cents) and 5 pennies (5 cents), totaling 20 cents with 6 coins. Alternatively, you can use 2 dimes (20 cents) and no pennies, totaling 20 cents with 2 coins.
20 Cents
$1 = 100 cents → 45 cents/$1 = 45 cents/100 cents = 45/100 = 9/20
That was issued in 1981 when postage went from 18 cents to 20 cents. It can still be used for 20 cents worth of postage.
To make 45 cents using four coins, you can use two dimes (20 cents), one quarter (25 cents), and one nickel (5 cents). This combination totals 45 cents: 25 + 20 + 5 = 45. Other combinations may exist, but this is one valid solution.
20 cents.
20 cents is equivalent to 1/5 of $1.
A nickel is worth 5 cents. If by "20" you mean 20 cents, you need 20 / 5 = 4 nickels. If you mean 20 dollars, a dollar is 100 cents so $20 = 2000 cents, and you'd need 2000 / 5 = 400 nickels.