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

b.15

c.20

d.28

e.17

Guest Jul 6, 2021

#1**+1 **

f = t = n five ten and twenty

5n + 10n + 20n = 560

35n = 560

n = twenty dollar coins = 16

ElectricPavlov Jul 6, 2021

#2**+1 **

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,

\(5a+10b+20c=560\)

\(a+2b+4c=112\)

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'.

\(x+2x+4x=112\)

\(x = 16\)

Because x is equal to the amount of each of the coins, she has **16** $20 coins.

Awesomeguy Jul 6, 2021