Krishaun has $5, $10, and $20 coins worth a total of $560. She has the same number of $5 coins as $10 coins, and the same number of $10 coins as $20 coins. How many $20 coins does Krishaun have?a.16
f = t = n five ten and twenty
5n + 10n + 20n = 560
35n = 560
n = twenty dollar coins = 16
Let's make the number of 5 coins 'a', number of 10 coins 'b', and the number of 20 coins 'c'. Writing as an equation we get,
We also know that she has the same amount of all coins, so we can replace a, b, c, with a common variable of 'x'.
\(x = 16\)
Because x is equal to the amount of each of the coins, she has 16 $20 coins.